Both very interesting with my interest piqued on the Greifeldt. At first I would guess sourced from Funk but I wonder if it is actually a model 531/533 with their patented(D.R.G.M.) auto ball lock safety along with a separate cocking mechanism for the solid projectile tube? Also I don't see a safety so I wonder it the lever on the left side is some Greener variant?

Kind Regards,

Raimey
rse