My clear-out continues - do have a look on <densemporium.weebly.com>.
I have found a number of Panodia view sheets as used for picture library submissions prior to digital. 6x6 cm new unused in unopened packet; 6x12 10 used, address sticker & numbers inked on, removeable with meths, 4 with hole strip cut off to fit in envelope. 6x9 25 used (as above) with hole edge cut off plus 3 intact used; 6x6 26 used with file holes, 9 without. FREE plus postage circa £6.00 at a guess, or collect for free too! Will check post accurately if anyone interested. Dennis.