Help id'ing sks stock, possible ddr

[Tygambit]

hey guys! Hopefully y'all can help me out.

Just got this Russian sks stock at a antique store for 12 bucks with a handguard. It's Tula Arsenal as it has the star. Also has 2 serial numbers, one stamped over the date I believe to be 1953. So it's def been rearsenaled. No cracks or chips in the stock, real nice shape.
Well on the other side of the butt, is a stamp of a number 1 inside of a triangle. I read that mark could be a ddr?

What exactly is the 1 inside a triangle mark?
Also I'm confused on what a ddr even is ?
Last, rough estimate of what it is worth? Well average price, on phone so can't upload pics.

Thanks in advance!!

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[WarPig1976]

DDR= East German property mark.
/1\= Russian refurb mark.
Value= $100 to $150ish. hold on to it because all the tactical Timmy's who chucked the wood "like yours" for Tapco stocks will eventually realize that was a mistake.