For sale is an Omega Speedmaster Professional "Moon Watch" 3572.50.00. It has an integral stainless steel Omega link bracelet with a double deployant push-release clasp, and a Hesalite crystal. There is a sapphire display back engraved with "FIRST WATCH WORN ON THE MOON" "SPEEDMASTER PROFESSIONAL". This watch is known as the “Hesalite Sandwich” and the caliber 1863 is more ornately decorated than the variant in the regular version (caliber 1861), as it is constantly on display through the watch’s sapphire caseback. View attachment 1662202 View attachment 1662203 View attachment 1662204 View attachment 1662205 View attachment 1662206 View attachment 1662207 View attachment 1662208 View attachment 1662209 View attachment 1662210 View attachment 1662211 View attachment 1662212