I have just found nine boxes, unopened, GePe 2mm thick Anti Newton slide mounts with metal masks. I also may have more, and I have, for anyone who is very serious about slides, a large quantity of filing cabinet hanging bars and slide filing sheets (Secol, I think). I'm talking about a weight of this stuff such that packing it would be difficult. It was supplied to us a decade ago in return for advertising space, and would be sufficienty to store a small photo library. Anyone interested, email me.