HSTE[Omega Moderator]
4555
I‘d go for the frozen Sinn or the old/new 2915 Speedy on sand....
Sinn U2C (limited to 50 pieces) at minus 24 degrees Celsius on a green silicone strap.......

..... or the Speedmaster 2915-1 next to the 60 years re-edition on sand NATO straps