Hi
Bit of history about George Case.
Bought Joseph Scates' business at 32, New Bond Street London in 1849 (George Jones in his 'Recollections of the English Concertina from 1844'- concertina.com) didn't seem to rate G Case as much of a businessman.
Advert in The Times Jan 1855 said that Boosey and Sons, 28 Holles Street, London had exclusive rights for selling George Case concertinas and that 'The personal attention of this eminent Professor will be given to the manufacture of these instruments, everyone of which will bear his name'
Wes Williams notes (concertina.com) that Case sold out to Boosey and Sons in 1856 so the deal was probably finalised between those dates. Therefore, if your concertina has an address label with an address of 32, New Bond Street it was probably made between 1849 (though, if he bought any stock with Scates business then early ones may be rebadged Joseph Scates conertinas) and 1855ish after that they were probably made by Boosey and Sons, Boosey and Ching or Boosey and Co Regent Street (wes Williams, concertina.com).
The bellows may have been fitted at anytime after this and had gold tooling at the choice of whoever paid for the bellows. i.e. they may not be original.
Case seems to have worked with his wife (Grace Egerton) as a concert performer after his concertina building period.
It's still a nice looking concertina though
hope this helps (and I'm sure that if I've got anything wrong someone will chip in)
chris