Longines OEM 21mm Rubber Strap & Push Button Deployant for Hydroconquest

Can be bundled with the watch, which is posted separately.

I don’t believe these are sold by Longines, and I think they are only available when you buy the watch on it.

This is a higher quality clasp than the strap longines sells for it for $315, so if you have a Hydroconquest you were looking to put on rubber, this is the strap to get!