EK2 Otto Schickle non-magnetic with LDO number L/15 with larger stamp

EK2 Otto Schickle non-magnetic with LDO number L/15 with larger stamp, this stamp extra rare & hard to find !!

In my opinion this is the most rarest O. Schickle piece, I’ve only found two pieces that are under 40 years old.
The condition is perfect

Otto Schickle’s pieces are popular in collectors’ circles, many people do not know what type of marking this manufacturer used.
The small one is more common (despite the fact that the marked pieces themselves are rare) and the larger type.
Not many of these marked pieces exist, so it is not easy to find them.