Here is an early 111, probably 1953/54-ish. Except for color on steel case and cookie cutter, it is very similar to this unit: Optimus 111 embossed probably 1953/54-ish. I thought that I had all color versions of the "newer" type of cookie cutter with sunken lettering in contrasting color (white, green and burgundy red). I have somewhere here on CCS seen a blue version being mentioned, but I had never seen one myself. When this one passed by I just had to get it. The blue cookie cutter is made of a black material, and then coated in blue color (unlike the other ones). The time markers are among other things: Old style case hinges. Old style clip inside case to hold burner in place when stove is folded/closed. Maintenance tool with open keys. No cut-out for the closure of the case. Burner with hexagonal base. Burner without hole for pouring down preheating fuel. Burner wind shield with scoop opening for pouring preheating fuel. Blue cookie cutter handle on control spindle. Instructions manual no. 79 that only covers the 111. Later manuals cover both 111 and the 22 double burner range. The 22 was introduced around 1955, and manual no. 79 was then edited to also cover the 22 and the spirit can no. 69. All in all my guess is that this one is later than the first version (1952) but prior to the launch of the 22 (1955) thus estimating it to 1953/54. I'ts raining right now, so I'll test it and hopefully post flame shots later.