EK2 iron Cross so called “LUG” with marked “Z” with 2 type

EK2 iron Cross so called “LUG” with marked “Z” with 2 type
I am offering this ORIGINAL EK for sale, this piece is included in Dietrich Maerz new EK2 book on page 511.
I think the cross was not included in the book due to its condition (I don’t even understand why, as it is very rare), but the core version is.

The maker unknown .In general, these pieces are unmarked, but on this the piece ,on the ring have marked mark Z .
There are two seed versions for this cross type, this is the 1 version..Although the maker is unknown, but in my opinion there is a possible Juncker connection between the pieces, since on this the piece a same marking “Z” can be found in very rare