EK2 C.E. Juncker so called ” common frame type ) with LDO marked mark L/12

EK2 C.E. Juncker so called ” common frame type ) very hard to find with LDO marked mark L/12
These types not common types , because not the usual unmarked pieces , but have on the frame back site a so called LDO marked mark L/12
The mm total and sharp , very nice collector piece !!