Jill H

Hello, Many years ago I inherited a concertina from my grandparents (I am now 60). I believe it to be a Lachenal Craine Duet Tutor. It works perfectly and I think it may have been refurbished some time ago because It looks and sounds immaculate. The serial number is 4194 and it has steel reeds. Could anyone please help with dating and which would be the best platform to sell it on please? I have attached some photo's to help. Many thanks