Left to right, Aug 1962, fount is stamped Model 501, it is burning and boiling water in the little tea kettle. Middle is my first 502 July 63. I usually burn kerosene it that one now. Right one came in the 502 aluminum box. was wrapped in what looks to me to be a flour sack. Got at an estate sale. Sticker on the closed box said "It works. $5" I opened the box just enough to see there was a stove in it and headed to pay for it. Pretty clean though the grill is bent down just a little. No biggy. July 65