https://forums.chiffandfipple.com/t/fs-wheatstone-anglo-concertina/90263/1
Hi Ronnie, I’ve changed the designation to Anglo concertina, since that’s important.
Also, the serial number 55670 suggests that this is a late, post-WWII instrument, perhaps from Boosey & Hawkes in the 60s or 70s. So the description as an antique may be open to interpretation.
Looks like a nice instrument, good luck!
- MTGuru / Mod
Might be worth putting an advert in the Buy & Sell section of the forums at http://www.concertina.net/forums, as that looks like a decent squeeze & you might well find an interested buyer over on C.NET
According to the Wheatstone ledgers this concertina was finished on April 30, 1953. The ledgers also list the model, a 5a with nickel plated ends.
Here is an article about the post war 50.000 series Wheatstones.
Thanks to all, indeed 1953. I should have put more info on there! Thanks!
Still for sale 
A Wheatstone concertina for sale in good condition. 2300€ o.n.o paypal payment accepted. Great antique instrument. Restored to playing condition. The concertina is from 30 april 1953. Anglo
http://imageshack.us/a/img834/2046/5u6w.jpg
http://imageshack.us/a/img856/1593/v5r1.jpg
http://imageshack.us/a/img843/3238/dnmi.jpg