My AD has just received a glycine airman double (the one with the yellow numbers on the dial). Its limited to 300 pieces and is a purist model. The watch has 3 crowns and I did play around a little with it. The crown at 2 o'clock moves the inner 24hr chapter ring, the one at 3 o'clock moves all 3 hour hands simontaniasly and the date. The 5 o'clock crown seems to do nothing and I couldn't figure out how to move the gmt hands seperately. I couldn't find anything online, anyone?