This rather tired SM7 Autodater from 1965 has a nice feature – raised hour markers at the 12, 6 and 9 o’clock positions that almost appear to be mounted on the underside of the crystal:
The markers cast a shadow on the dial, quite a nice effect. Here’s how it is achieved:
The SM7 is the day and date version of the SM range, and uniquely used the 23 jewel 4600 movement. The SM’s had a short production run using the older 4xxx base movement as seen in the Jet models, but with a swinging weight rotor rather than the circular geared type. In 1965 the 52xx movement was also launched, as seen in the Crystal Seven range, which was the more modern design at the time and quickly superseded the 4xxx.