Larry,
yes thankfully the weather is still pretty mild in Chicago area, so definitely enjoying it

..
Well regarding the lens.. it is unmistakably a Jupiter 8/8m shaped body that's how I can tell...
The engraving.. well there are two possibilities:
1. someone had a professional repairman change the engraving to Zeiss, it's not that hard, in 1990s there were tons of fake Zeiss and Leica lens that looked a lot more professionally redone that yours.
2. another a less likely but viable scenario is that camera was modified in a KGB workshop that each factory like KMZ and Arsenal had during those years to be disguised as western camera as it was easier to and cheaper to modify these than to buy western counterparts.. I generally don't like to believe that romanticized spy story but there is a chance that is how it happened because these workshops were real and produced plenty of spy gear. I guess we will never know for sure but that gives you several hypothesis to choose from

It is indeed an interesting story about a Russian soldier and it is also very possible he had stole it from headquarters to make some money on.. very common scenario is USSR as unsupervised government equipment tended to disappear

in terms of engraving looking professional I tend to disagree, from seeing a lot of fakes this one is absolutely one of the most fake looking

. Someone could easily done that with a steady hand and an engraving machine.
Best regards,
Vlad