even with such clear as muddy water pictures you can see the date is overs tamped with new zeros. You have refurbished revolver, so anything goes. If your side plate matches the frame that's all you should care with refurbs
it's not unusually for the soviets to scrub czarist stamped firearms and to re-stamp them with the soviet arsenal stamp during a refurbishment. although some have escaped this, I have one that was made in 1915 and was refurbish, and they didn't scrub the
Imperial Peter the Great
in your case, they scrubbed
and stamped the Tula star and re-stamped it with the original year it was made, why? no idea. but you can see a bit of the original year stamp.