Here's the ultra-rare Enicar Ultra-Dive, a 1960s legend for obvious reasons.
Check out the target-like black dial with the white internal bezel, controlled by the upper crown.
The case is a massive 43mm across, not counting the crosshatched crowns (lower signed, upper unsigned)... by an amazing 50mm from lug to lug.
This is the twin to the highly sought Sherpa Ops, with the only difference being that the latter has a PVD finish.
The 17-jewel automatic movement keeps excellent time.
Strap this on and prepare for stares.