Nice. Always nice to get an accessory tin. Are the discs inseparable like the W&W 9? Reminds me a bit of those (which I don't have) but also like my straight stitch Junker & Ruh.
I think this might be for industrial machines, but maybe there is something on
http://sew24.blogspot.de/p/downloads.html
Janey - Neat people never make the exciting discoveries I do.