My daughter works part time at an auction house while at uni.

She recently bought one of the items that hadn't sold. It's an accordion, complete with case.

The case is the sort of "utility" material that you'd get in the 1950s. The accordion is a Bell "Professional" model with a grey marbled effect finish. Can't see the exact model or serial number, but there's a Bell booklet in the box, again in the style of 1950s publications, where the exact model is shown and called "The Professional" with a retail price of £90 00s 00d listed.

It sounds lovely and is in good nick except that the bottom strap button is very stiff to do up and undo and the keys are quite yellow.

Any ideas of what its current value might be (or a range...I know that it'll vary according to *internal* condition, not just external appearance)? I think she paid about £30 for it.