Cartier Stunning Launch: Sincere Product - Latest Version of the Quick-Release Cartier London Series .Introducing the original 40mm mold first .1. Quick-release design allows for easy hand change in just 10 seconds .2. Fully automatic mechanical movement upgraded from the original movement, offering silent operation and enhanced battery life .3. Sapphire glass with blue steel hands .4. Latest version features original gray background with oil-based black numeral calendar .5. Roman three-dimensional markers .6. 9.6mm thickness, matching the original .We have put great care into this watch for all watch enthusiasts. You are welcome to appreciate it!