May have been re-barreled by the Maker. I have an Atkin made in 1926 that was re-barreled in the early 50's by the Maker. It has the address on the barrels for Atkin when they moved to new address in the 50's.
So what year was your Grant made? I have a bar action, sidelever Grant hammer gun made 1889. It was sleeved last year in the UK and re-proofed.


Mike Proctor