Corrosive or not?

[dirtbag]

Hello,
I have brought some 7.92 x 57 mil surp ammo that is 1953-55 manufactured with 198 gn FMJ ball bullets.
Does anyone know if this is likely to have corrosive primers as I cant seem to find a definitive date when the change over to non corrosive took place. Afraid I wont be able to give any indication of head stamps until tomorrow afternoon (when it arrives!)
Thanks

Yes it is for sure, but as other members said , no issues just boil barrel through and patch until crystal !