According to the catalogue material I have seen, 5,6x61 Vom Hofe and 10,75x68 were available as "special order", I was once offered to buy a ZG-47 in 5,6x61 from a gunshop. I have fondled with a 10,75x68 that belonged to a German - no idea if it was original or not.

Hasn't Alf got a ZG-47 in 9,3X64 Brenneke?

Cheers
/Johan