I bought mine from here. I don't know if he ship orders or not but I'll leave the page if someone wants to contact him.
https://articulo.mercadolibre.com.ar/ML ... FromParent
Sorry for my potato camera


I love those keycap tops, maybe I'll do something for my M 122 with these

Also the stickers look so cool

It uses a normal RJ45/PS2 connector

Proud to have a genuine IBM keycap puller

Here it says "In order for you to use this keyboard, you must customize the KBD50.COM keyboard driver. To do this you must execute KBD50CUS.EXE Both on the KBD50.COM and KBD50CUS.EXE files are on the device driver diskette. The device driver diskette and two diagnostic diskettes come with the IBM 47700 Financial 1/0 Hardware Guide.
Permission is hereby granted to use the KBD50CUS.EXE and KBD50.COM with this 50-key keyboard."

I would like to see what I need to do to configure the keys. The original matrix is something like this (is just weird). If someone know how please tell me.
