New STEEL MAINSPRING for the Hamilton model 22 movement, the smaller chronometer.  (Do not confuse with the large 85 size spring detent chronometer model 21).  We have been repairing Hamilton chronometers and deck watches for many years.  We have slowed down and have more parts than we need. Hence we will be selling model 22 and model 21 parts.  See our other items for sale.  We will be listing these and other WW2 military parts the next few weeks. NOTE THIS IS A VERY LARGE SPRING AND IS HARD TO FIND AS WAS ONLY MADE FOR THE MILITARY.  This stock was from the estate of a 95 year old watchmaker.  They were loose in a bundle and had to be rewound into these containers.  See second photo.  Thickness is 0.2 mm.  Very long!!