RK marked for confirmation copy

[U-21]

Hallo, I ask you for confirmation. I think this RK is an old marked copy (also on the ring). It's correct?
Many thanks for help.

Regards, Uwe.

[U-21]

Kkk

[Erickn]

Hello,
It is not pre-May 1945 manufactured, far from correct, bad fake.
Regards,
E.

[Douglas 5]

A post war copy that has been around awhile .

Douglas

[Ludwig]

Fake.