I have about 20 of 35mm slide film mounts (like one uses for a slide projector). Most have glass, some just plastic frames. A few have some writing on the frame that could probably be removed with alcohol.
I am happy to post them as I am not in the Stirling area, but near Crieff, so collection is not possible under current restrictions.
35mm slide mounts (Dunblane FK15)
This offer has been gifted to someone and is no longer available.