Notes: The 4478 was a higher grade watch from the precision line. It features a sub-second hand and an 18K yellow gold case. The dial face is typically cream or white.

Mechanism: The 'Precision' series of the Superbalance represents the 3rd generation of Hunter movements made by Aegler for Rolex. They replaced the earlier Superbalance series and use a much simplified balance wheel. They also moved the Hunter from 15 jewels to 17 jewels. With the introduction of this 3rd Hunter, Rolex started referring to the mechanism as the 700 instead of Hunter 10 1/2, although the mechanism is still stamped 'Rolex Patent 10 1/2 H' and typically (but not always) signed 'Precision' on the main plate. I guess Rolex owned the patent even though Aegler made the watches.

The 710 is closely related to the Aegler 700. The primary difference is the position of the second hand. The 700 is "sub second", whereas the 710 is "center second".

Family Notes: The Precision is one of the most overlooked Rolex models ever made. This series is unusual not only because they are dress watches, but also because most of Precision models are powered by a manual-winding movement.