Welcome Jerry! Some pictures of the stamping would be helpful. Is it a round "Made in London England" or straight line "London, England"? Straight line usually means before 1981, at least on GBD's. Irwins is a GBD second line and the 549 is a bent bulldog. I just posted the restoration of a GBD 549 in the Restoration section and own two other of that model, one of my favorite GBD shapes.