War Merit Cross with Swords 1st Class. Info and Value please.

[terry.h]

Could anyone please give me some info about this 1st Class War Merit Cross with Swords please? It is in excellent condition, has what I have been told is the 'coke bottle' pin which is stamped L15 and has a barrel hinge. I need the info about the Cross simply to sell it, but I would need to know more about it because I have been told that the manufacturer L15 makes it a more sought after example....but I don't know.
Thanks in advance,
Terry

[terry.h]

b)

[terry.h]

c)

[Dietrich Maerz]

Nice Friedrich Orth.