I believe the gun is a bought in Birmingham one, for resale. The shop at 4 Leith St Terrace was long closed by then, "Leith" is the town to the northeast of Edinbugh (the shop at No.4 was off the Leith Walk). It might have been part of Daniel Fraser's son's effort to get the business going again after the Great War.

The gun does not even remotely look like any of the A&D's Fraser's had put out before, let alone their patent boxlock.