I would think it so, more pictures would certainly help. As for the above reply, sorry but I have to disagree. I’m not saying it’s impossible but the odds that he’d be finding Factory 53 ammo is ultra unlikely. First of all that’s not how headstamps work. They don’t stamp the name of the rifle on the head, it’s factory number or caliber in any case. Second of all, factory 61 is one of the two most common found imported of this caliber. There is a recorded factory 53 but I’ve never seen on any site, forum, or come across any Factory 53 ammo, and it’s more than likely a small run, possibly war time or specialty loads, and more likely rare. Where as factory 61/ produced in 53 would account for probably at least half the 7.62x54r ammo we get from China.
But in any case they don’t stamp 53 on heads for the type of rifle.
Factory 61 is the most likely, and that’s great news, enjoy your ammo, I find it my favourite surplus round to fire, they’re cheap and up to par with anything else in the price range and availability.