steel vs alloy? Gloss vs Matt? One is cheaper to make than the other? Maybe the lenses are slightly better in the newer model, but most would not tell them apart. I have a Schmidt 6x42 in the same era as the Diatal, steel tube, amazing quality and virtually indestructible. -Z
I have one identical to your first (earlier) picture - brilliant scope - very clear and nothing to twiddle with. Sometimes I think maybe I should stick my previous line up of all 6x42 scopes.