I believe these to be a working set and a spare set used in a Charles Frank reflector which had been installed in a gentleman's garden in Stockton for a number of years before changing hands, being subsequently damaged and the mirrors salvaged. All the parts I have bought have been stored on top of a wardrobe for the last 4 or 5 years. No other parts from the original telescope remain.
I hope to receive these myself in the next week or two.
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