Kinversam

Hi All, Just picked up my first EC from Chris Algar a few weeks ago, it's a tidy (to me) 5-fold Lachenel 48-key, black wooden ends, steel reeds and (I think) nickel buttons. It has lost its outside serial number but opening it up it is 37755. Having a go at tunes for a Ceilidh band, would be lovely to know an estimated date? Cheers, Sam