EK2 Iron Cross / Eisernes Kreuz Wächtler & Lange with so called double marked mark PKZ & LDO 100 – L55 in 100% mint condition

I have this item on “commission” sale, I just trying to help the owner sell.(I did not set the price)
Part of a larger collection, presumably, other rare pieces will become available in the later time.

EK2 Wächtler & Lange with marked mark PKZ number on the ring and on LDO number L55 on the frame on the back side

This the piece a really unique type, because as both signal types can be found on this piece

The condition is 100% in mint and perfect piece, and the marked mark full, total and nice, but as you can see in the picture, the light of the flash is very reflected from the frame, so the marking is not really visible
the last picture was therefore taken without flash

the ribbon size full 300mm long