I hope that I have posted this thread on the correct section?

A old friend has recently been widowed and her late husband had many rifles, shotguns and air rifles, all have been disposed of except for the one I would appreciate help with identifying and if possible? some idea of it's value.

It's a BSA make air rifle with the stamp of 14270 on it.
It's in a lovely condition with no obvious faults, it has been re-blued.

I wish that I could post a photo of it but the Airgun BBS system for doing that has defeated me, too complex I'm afraid for me.