Hi Phil and thanks sending me the recent info about the 'Mag-Lite® C & D Cell Flashlights Repair Manual' now found at manualslib.com. This PDF is very useful...
Finding this type of OEM repair info on the Internet is often difficult since some 3rd party Internet search engines restrict and re-prioritize search results solely to benefit that company's corporate profits.
It amazes me how much interesting Internet info is restricted and hidden by large search engine companies in their blind attempts to increase profits by restricting search results.

Where Is Maglite Serial Number Located Location

I just found a Maglite in my storeroom. Serial number is D. I assume it’s a 3 x D cell. Still has the mounting clips with it. I reckon it’s been in storage since the early 90s. I've noticed it doesn't have that strange logo on it next to the word 'Maglite', and California is shortened to 'Calif.' On it instead of 'CA'. The serial number on the side also doesn't have any letters in it. Does anyone have any idea exactly how old this model might be?