Hi Everyone I have just recieved these two stoves and they have me a little confused. Firstly the Primus No4 Is that the orginal burner for this stove, And its date stamped under the tank U 13, So is that 1930?? The SWS, I cant seem to find much on that. It has SWS No5 Soutterware Wickless Made In Englamd on the tank and on the pump stem cap, F W Lindovists, patent, stamped on it, They does not seem to be anything stanped under the tank. Is that the orginal burner and if the spirit cup is on the tank like that arnt these the first stoves of this type?? It feels to be made of quite thick brass. Unfortunatly i do not have the cap and its had a hard life with a few messy solder repairs. Any info would be great, Thanks everyone.