Greetings, Recently found in Canada through another Collector, this Primus No. 50, now resides in my Collection. Not quite complete, missing it's Pre-heat Cup and Stove Grate, but in great working order otherwise. Haven't fired it up, lacking the Pre-heat Cup, but I'm sure it'll roar back to life when it gets one, in the future! Can anyone date the old beauty? Do I have to remove the Brass Collar at the Bung, to reveal the Date Coding? Can anyone tell me what the "Clamp" was used for on it's Fount? Thanks and enjoy the pics!