Dateline TM-6900
1968–1971 · 10k Rolled Gold Plate · Automatic
About the Dateline TM-6900
Made from 1968 through 1971, the Dateline TM-6900 is part of Hamilton's Dateline family, a line built around automatic movements and clean, modern styling aimed at the late-1960s market. The case is 10K yellow Rolled Gold Plate in a round shape, and the movement inside is Hamilton's caliber 629, a 17-jewel automatic with a sweep seconds hand. The silver dial carries applied gold markers and no numeral hour markers, keeping the look minimal and open.
Applied gold markers on a silver dial can show their age in specific ways: look closely for any that have separated, shifted, or lost their finish, since replacement markers rarely match the originals well. The 10K RGP case holds up reasonably well over the decades, but the plating on high-wear areas like the lugs and caseback edge tends to show brass underneath before the rest of the case does. Finding one with clean, even plating and an undamaged dial is the real challenge with this model.
From the Catalog
Hamilton positioned the Dateline line at the practical end of their automatic offerings, and the TM-6900 retailed at $99.50 in 1968, making it accessible without being entry-level. That price point reflected the 10K RGP case and automatic movement in a package aimed at buyers who wanted Hamilton quality and a no-fuss daily wearer.
Hamilton Catalog Images
1968
1971
What to Look For
| Dial | Inspect each applied gold marker carefully under good light. Look for any that have separated at an edge, rotated slightly, or show tarnish around the base. A dial with all markers intact and flush is worth paying attention to. |
| Crystal | The TM-6900 would have left the factory with an acrylic crystal. Check for deep scratches or a hazy center, which can dull an otherwise clean dial. Light surface scratches can be polished out, but cracks mean replacement. |
| Movement | Ask about service history. The cannon pinion in the 629 is small and can loosen over time, causing the hands to slip or the watch to run slow. Dried lubricants are also common in movements this age and can create enough friction to stop the watch entirely. A recently serviced example is worth the premium. |
| Case | This is a 10K yellow RGP case, so look at the lug tops and caseback edge for brass showing through the plating. Some wear is expected, but heavy exposure on the lugs changes how the watch sits on a strap and can affect long-term value. |
| Crown | Check that the crown screws in and out smoothly and that the watch winds and sets without slipping. A crown that feels loose or gritty often signals a worn stem or a movement that needs attention. Also note that the original waterproof rating no longer applies to a watch this age. |
The Movement
The caliber 629 is a Hamilton-labelled automatic built for reliable everyday wear. It runs on 17 jewels with a self-winding rotor and displays seconds through a sweep hand rather than a small subseconds register, which suits the clean dial layout of the TM-6900. It is a straightforward movement to service when parts are available, though the cannon pinion is notably small and requires careful adjustment to keep the hands running true.