It's the Sundial Wrist Watch, with a space to place a
20mm Compass Insert. I recommend a compass with markings that will allow you to adjust for
Magnetic declination. The Sundial Wrist Watch will be most accurate if 12 noon is pointing to true north. This model of the sundial wrist watch is desinged to be used near the latitude of 27.75° N, because of it's small size it should still be reasonably accurate if the latitude is within 10°-15°.
This wrist watch is designed to fit
a 20mm wide / 1.5mm thick one peice watch strap.
Things to keep in mind if you get this printed in Acrylic, it is more must fragile than Stong & Flexible or Metal. The gnomon (the triangle that cast the shadow) can break if you are not careful. Also after wearing Acrylic Sundial Wrist Watch, the supprots for the watch strap will bend to conform to your wrist.
This sundial is designed for standard time (winter time). If Daylight Savings Time is in effect, remember to add an hour.