Welcome, Terry. If you look in the Reference Gallery in the Primus No. 71 section, you will find stoves similar to the one you have that is not marked. Look for differences such as key, filler cap, safety valve release etc. Cheers Tony @Terry Moore
@Mr.stove Indeed! How could it be 1918? I was just responding to the fact that @Terry Moore said it had “H” on the bottom. Maybe it’s not H or not a date stamp. Terry, A few photos would help. Cheers Tony