Well-spotted, and well-picked. Mine took me a little longer.
British banks also supplied similar home safes. Several were patented in the 1920's and 30's; older ones tend to be heavier. Most of mine have a 3-lever lock, some with bullet wards but most not. They continued to be offered into the 1950's. After that, banks more often sold something fancy, usually made in Finland and taking a simple standard double-bit key operating 2 springbolts.
(Don't have one within reach now, but the mark is 'MK'.)