Not sure whether this particular model dates from 1914 or later (in which case it would have been manufactured by AB Optimus). It is the same as a No. 1, but with a thinner-gauge tank. This example is in excellent condition with all-original parts, complete with Lux-stamped cast-iron trivet (with some gold paint still visible) so it's a useful "reference" stove. I have an identical period Lux No. 1 in similar condition and will post photos of that one as well.