The crown, a simple part of the watch that is usually taken for granted.
Imagine a crown with a deep engraved S, check out this website: 23:59.net
Aside from sapphire, this crown will give your watch a very cool new look.
At 23:59.net you can send in your crown and have it engraved. This is perfect if you already own a watch.
I offer this engraved crown, installed, as addition to an ordered watch (SKX-variants except SKX013 and New Turtles). This saves you the trouble of removing your crown, sending it in and waiting for it without a crown on your watch. It is also possible to just buy the crown.