You might also want to contact the owner of Omega-Weapon-Systems down in Arizona, USA. Several years ago, he had a few MG34 Lafettes for sale. Some were dated as early as 1937-?
If I recall correctly, they came out of old Russia...through one of the Surplus-Dealers (Ryton-Arms of the old "Firepower, Ltd." or "Firepower, Int.") in England.
This may be where SARCO, Inc. picked up all of their MG34/MG42 Lafette used spare-parts and assemblies they sold off in "bulk" to Allegany-Arsenal a few years ago.
If you go waaaaaaaay back, Bob Landies of Ohio-Ordnance-Works (Pre-1990) was one of the people selling large amounts of Norwegien surplus MG34 Lafettes, MGZ34 and MGZ Optic-sets with cans/accessories, MP40 and MP44 magazines in bulk, and some other items. He may have kept some of these items for his collection (?)....photos-?
Regards, RichardS in Bay City, MI 48706, USA
US Army, RetiredBlanksguy2001@charter.net
PS: Let me know if you locate an MGZ40 Collimator for sale.