Hi I have just acquired a 20b concertina in the hope of "doing it up". It looks very similar to the lower end Lachenals, but the label (where the Lachenal label would be) states "T. Bennet & Bennet, manufacturers, St. George's Mansion, 81 Theobalds Rd., London, so is it a copy. I had a look inside and the only number I can find is L or R 458 stamped into the bellow ends and the reverse sides of the action boards. If this isn't a copy I assume it was made very early on. I am hoping that I have attached a photo, but am not too sure how to do it   Wendy