The vintage Sportmatic 5 has been changed to a screw-down crown! It uses a set of crowns sold on the net.。 I used a type that also cuts screws on the case side、I bought a tap and cut a screw。 It's like this。Please do not touch the crown mark w I feel a little relieved against water。 When you pull out the crown, it looks like this。 It's easy to turn and I'm very satisfied。 I also tried to make SNZF17 a screw-in crown。 This is one end of the divers ... that? Isn't the dial anymore divers? SNKE01 is also a screw-down crown。 The middle case is SNK355。 That the、I bought a lot of crown sets、I'm changing it to a screw-in type。 I don't know how much the waterproofness has improved W Well、Is it a matter of feeling?