I was not sure where to put this entry, as it's a Primus, but made in the US, with no indication of exact model. I know we have a few US Primus No. 1's in the standard Primus gallery, so I will put it here in the "other" model category. I got this one about a year ago as part of a beautiful antique formaldehyde vapor generator (sickroom disinfecting) and got round to fiddling with it a bit. Of particular interest is the plain styling of the tank, with no marking save for the filler cap. In fact, the tank resembles that of the AE Lovett stove as featured in the US ref. gallery. Also, note the non-removable pump tube and NRV that is similar to the Swedish style but with some modest differences. The burner is unmarked and features a screw-in inner cap as is found on the other US Primusses displayed. Outer cap is an incorrect type I stuck on for effect. The pump rod has a very nice 2-piece brass washer carrier, and features a brass washer soldered to the rod, backed by a leather washer to form a good air seal on the pressure stroke. A nice bit of refinement. The NRV works much like the common Swedish style, but has a sheet brass body perforated only by the thin slot in the rounded end. The sealing pip is of cork and fits in the brass carrier. This in turn slides over the elongated end of the NRV body. The spring is substantial and made of brass. Overall, the stove is utilitarian, but shows good workmanship in all details. Machining is excellent, the burner looks very well made, and the tank is of fairly heavy brass which shows no signs of stress cracks. I hope to upload some more photos when I get round to really fettling it and have it running again! Regards, Doug E.