What came up unexpectedly from the depths of the dutch larder is this dented but wellknown shape of a Primus tank. If the SRG of CCS is a yardstick - and by now I think it has considerable authority - then this No. 57 is a rather unknown niece in the Primus family. Shown in a late 30's brochure it was supposed to be fitted with the rather enigmatic 4047 burner and meant as a heater / cooker combination. That would call for a build-in cleaning needle, actuated by a rack-and-pinion set in the detachable base, as is depicted there. To my surprise this tank shows a tapered female connector, while the production code says 'Y' on the bottom. This to my mind makes it a very early production of the changed connecting set-up meant to reduce costs and seen on more models usualy after 1935. This nickled tank lacks a rather unique male connector, as the more known No.110 model heater has that connector soldered onto it's tank, and I am not sure this item is identical to the item on the 107 model.