Couldn't get a decent picture of the rule with the flash. Will try again in daylight. I wouldn't know a tinsmiths rule if it bit me.
This one has short sections of 32nds and 64ths. The rest is 16ths and 1/8ths. Hinge end is marked in degrees.
Maker J Rabone & sons, Birmingham England. # 1646S
Pictures added.