I mainly collect 'non-letter serial' D cell Maglites. What does this mean? Maglites without a D in the serial number are from before 1992. These lights are quite a bit different from the later 'letter serials'. The biggest difference is the size of the light. Non-letter serials have a much thicker body and weigh much more. This gives them the feel of a much more sturdy, durable light. If you've never held one I highly recommend it versus a new Maglite as it feel like a different light entirely. See below for an example of a letter serial versus a non-letter serial.

• Original Maglite part. Suitable for all D cell MagLite flashlights and C cell Maglite flashlights without the 'C' in the serial number.
• The serial number is located on the flashlight's barrel near the front. Mine is a 'D' series. There is also a 'DL' series. This video for taking your Maglite apart.

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Shown in the above pic is a 3D letter serial (bottom) from around 2000 and a non-letter serial 3D from around 1980 (top). The leading digit, 3, specifies the cell size in the non-letter and the leading D and 3 in the letter serial specifies the cell type and number of cells. The rest of the digits specify the number of the light in the production sequence. All lights started at number 1 and worked their way up. So, the earliest 3 cell light would be 30000001. The non-letter light on top is 30051558 so it is the 51,558th 3D cell light produced. This numbering carried over in 1992 and did not reset when the letter serials came out. Older lights did not differentiate between the cell type in the serial. Newer LED lights will also have other letters on the prefix side as well. This blog is specifically about incandescent lights.
Shown below is a new (1992+) end cap threaded into an old (1990) barrel to show the difference in size. The red barrel is an old production non-letter and the jade end cap from a new production letter serial.
The secondary update was to the switch. From 1979 until 1992 Mag Instrument used a retaining ring switch. The retaining ring was made out of aluminum early on but was changed in 1990 to plastic. The aluminum ring resulted in more difficult maintenance because the retaining ring gets stuck when dirt or corrosion get into it. The aluminum ring also resulted in higher production costs because the aluminum is more expensive to produce than the plastic. The 1992+ letter serial switches use a snap ring instead of a retaining ring which also results in less machining and a lower production cost.
Shown below is a 1979 to 1989 aluminum retaining ring switch on the left, a 1990 to 1991 plastic retaining ring switch in the center, and a 1992+ retaining clip switch on the right. The retaining clip is difficult to remove from the barrel and removal is not needed for most maintenance. It should be noted that Maglite still sells retaining ring replacement switch for older lights but they are now all of the plastic ring variety. The aluminum ring has been discontinued since 1989.

These non-letter serial lights are far less common than the later lights. A new 3D is around a 48,000,000 serial which means Maglite has produced around 48,000,000 3Ds as of this post date. Mag Instrument will actually tell you the date a light was produced based on this serial number although I have a Quick Dating Guide that will give you a rough idea without having to go through Mag.
It's interesting to note that when 1992 rolled around only 4,000,000 of each model, and sometimes many less, were produced when the lights changed to the currently available models. Currently Mag Instrument will sometimes sell 4,000,000 lights of each model a year so non-letter serials are much more rare due to their low production numbers and age.
The variations on the standard black model are also much more rare on the earlier lights. Lights came in far fewer colors and there were far fewer special editions than there are on the newer style lights. I've detailed these here.
Another easy way to tell the difference is the addition of the panther logo on the bezel of the new style lights. According to Mag Instrument a panther represents a creature of the night and was added when the models changed in 1992. Shown below is a new style letter serial with the panther logo on the bezel on the bottom and the older style bezel on top.

Maglite is known for making durable flashlights, and I have had one of their older incandescent flashlights floating around since forever. Let’s see if their LED offering meets the hype and is worth the approximately $30 at the time of this writing!

First, a note about LED Maglites. There are three generations of Maglite LED flashlights. While all stock in inventory at all major online and physical retailers should be the 3rd-gen product by now, it’s something to be aware of. Be sure to get the third-generation light as it’s more energy efficient and brighter than previous generations, and while 2nd-gens are OK, the 1st-gens had major overheating problems.

• Gen3 uses a Cree XP-E LED, has a serial number beginning in D, and the LED has a square base. Also, it advertises 168 lumens on the package.
• Gen2 used a Philips Luxeon Rebel LED, has a serial number beginning in DL, and the LED doesn’t have a square base.
• Gen1 used a Luxeon III LED. also has a serial number beginning in DL, and the LED has a dome over it with a black plastic ring around it.

Build Quality and Features

Of course, Maglites have a reputation for durability. Just like previous Maglites, the Maglite LED is built out of a sturdy metal housing, is water resistant (IPX4 rating), has a 10-year warranty, and is proudly Made in the USA.

Even before installing batteries (not included), it’s a hefty thing that could be handy in an emergency situation. Since it is beautifully machined and has no sharp edges, you don’t have to worry about hurting yourself grabbing it in the dark, unlike some similar flashlights I own or have seen.

On the Maglite, unlike many other competing flashlights, the power button is within reach of your thumb, rather than on the end. This is a matter of personal preference, but I have flashlights with both setups, and it’s fine. The button is covered by a rubber thing to keep it comfortable and keep water and stuff out. It’s worth noting that on the older incandescent Maglite I have, it was given to me because the rubber thing fell off, so it’s not something I would trust outdoors anymore. Hopefully they’ve improved the product so that the rubber button cover doesn’t fall off so easily on the newer LED models.

The button can either be clicked on or off, or you can press it lightly for momentary light. The momentary feature is cool if you need light suddenly but don’t want the audible click of turning it on, or just need light for a quick moment. Since quite some pressure is required to turn the flashlight on completely, it’s unlikely that it’ll accidentally turn on when banging around in your truck or toolbox or whatever, which is great.

Brightness and Runtime

Mag-Lite advertises 168 lumens of light output and 80 hours of runtime for the 3 D Cell size – smaller AA, C, or 2D Cell flashlights will deliver less runtime, though it’s worth noting that the 3 D Cell and 2 D Cell flashlights are the same brightness, and the only advantage to the large 3 D Cell unit I purchased is size and runtime. I’m not going to waste a set of expensive D batteries and sit here for several days with a timer, but from what I’ve read online the runtime on this flashlight is excellent, though apparently once the batteries get low, it does get noticeably dimmer. One major improvement between the Gen3 and Gen2 Maglite LED flashlights compared to the Gen1 flashlights is that instead of simply shutting off when the batteries are weak, it continues to operate at reduced brightness, which is very helpful so you aren’t stranded without light.

As for the light output, the 168 lumens the Maglite produces is really not competitive to other flashlights with a similar price range. Most similar sized flashlights offer 700-1000 lumens, and many smaller flashlights are available with about 300 lumens of output. One thing I don’t like about the Maglite is that while the lens adjusts between a wide-angle spotlight and a more focused light, there is a black spot in the middle when you de-focus the beam. Other flashlights I own don’t do this as much. It’s not a major issue, it’s just annoying.

Maglite Serial Number

Value and Conclusion

In terms of value, I don’t think the Maglite is the best deal out there. It’s got about 1/5 of the brightness as other similarly priced flashlights.

Magnalite Model Numbers

If you don’t really need a very bright light, and just want a quality American made flashlight that you can rely on for many years, the Maglite is for you.

Maglite Parts And Accessories

I’m going to throw my Maglilite in the door compartment of my Ford Escape, and it’s going to live there. If it fails anytime soon, though I don’t expect it to, I’ll update my post. Otherwise, you can assume it still works.

Where Is Maglite Serial Number Located

You can buy the Maglite on Amazon.com here, or if you are a Costco member, check there, because I’ve heard they sometimes carry a twin pack that comes with a “mini” AA version of the Maglite packed with the large D version for about $30, which is a darn good deal!