Thanks driftingmason6 for the photos.
This lighter is clearly the work of a skilled hand. Lighters like this were mass-produced back during WWI—that’s where the term "trench art" comes from. Obviously, they weren't being made in actual trenches, but rather in barracks or workshops near the front lines. Most were made from brass since it was everywhere, sometimes mixed with copper.
As for this specific one, I’d guess it’s maybe 50 years old, just like you said. Some guys kept making these kinds of lighters in their shops after WWII, which is probably what happened here. Honestly, it's tough to be 100% sure about authenticity, but based on my years doing this, I’ll take a shot at it. I have plenty of genuine "trench art" pieces in my collection, but also stuff made much more recently—like in prisons or by private craftsmen who just had too much time on their hands.
Value-wise? Since it isn't even close to the World Wars, I'd say it's worth maybe $10-$15 at best. Real "trench art" lighters can hit $20 or even several hundred bucks on the global market. Just a heads up though, there are a ton of fakes out there, and some are pretty damn good.
So, driftingmason6, don't bother looking for any certificate or paperwork of authenticity because that doesn't exist for a piece like this. You aren't going to make much money off it if you try to sell it anyway. My advice? Use it for style if you smoke, or just keep it as a cool little trinket.
And yeah, with all due respect to your grandma, there’s nothing on this lighter that links it to the Russian military. Though, I guess it’s possible it was brought over from Russia.
To wrap it up: it’s maybe 50 years old, worth no more than $10, and has nothing to do with any wars or militaries. If anyone actually wants to see a real "trench art" lighter, I’m happy to post some pics. Right now, I’ve got a WWI-era ashtray with a matchbox holder handy, just so you guys can see what the real deal looks like.

Hope that helps a bit. Cheers!
👋
P.S.: Forgot to mention, your lighter isn't complete. It's missing the chain that connects the flint tube (under the wheels) to the wick cap.