The code for the the M.A+ back zip is S1N3Z if you guys want to try ordering a pair- Hostem and PnP were the only too places that purchased the black horse iteration. Sartorialoft has a few left too.
EDIT: If there are any m.a+ 41's (runs slightly big or TTS with insole) out there- I'm open to selling both my black horse and coal buffalo back zips. Both are sz41. PM me an offer. Need funds for BBS leather. & too, too many boots.
INK has one sz 41 in calf at the moment because M.A+ sent the wrong leather for my special order- Hit Pita up to purchase.
This april archive had MA+ backzips. Did they stop carrying it? I tried it there and the fit was very loose at least 1/2 size bigger. So be carefull. I could have easily fit a superfeet in the sz 44 boot ( my size)