This is the first lamp that was produced under the Primus name. It appears that it was a combination of ideas and parts bought in frm other companies. The burner is identical to a type found on Lux and Aladdin lamps of the same era. This one is from 1912 (B) and judging by marks around the tank, was most likely mounted in a hanging frame. The tank is approximately 24cm in diameter at the widest point. This one is not working as it is missing the flame spreader.