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I think they were made around 1900 to 1930, but I'm mainly guessing that. Somewhere in the deep recesses of what used to be a brain made me put a date of 1920 with them but cannot recall the reason....

If you simply are looking to sell it, then you are in the wrong place, as neither sales nor even valuations are allowed in this part of the forum. It's a shame that you want to sell, rather than...