Thank you for a concise and informative post. As usual.
And, for taking the time to dismount the dial, never an easy, worry free task.
I think the watch is a lovely original 17j Shturmanskie, with beautiful patina.
I should have made more of the radium burn on 17j dials,as another clue to originality, they seem to have a propensity for it.
Definitely affects the 17j dial more than the 15j, because of the different materials in the dial make up.[although annoyingly not all are affected]
Near impossible to fake though.
Very Best Regards,