Thinline 4002
1962–1964 · 10k Yellow Gold Filled · Manual Wind
About the Thinline 4002
The Thinline 4002 was produced from 1962 through 1964, part of Hamilton's Thinline family, which emphasized slim proportions and clean modern styling during an era when thin watches were genuinely fashionable rather than just a marketing angle. The case is 10K yellow Gold Filled, round in shape, and powered by the manual-wind caliber 687 with 17 jewels. The dial is silver with painted black markers and no numerals aside from the Hamilton H logo, giving it a spare, graphic quality that reads as confident rather than incomplete. Hamilton marketed it alongside the closely related Thinline 4003, which shared the same basic profile.
The no-numeral dial is the defining feature here, and it's where condition really matters. The painted markers on silver can show fading or spotting with age, and since there's nothing else on the dial to draw the eye, any deterioration is immediately visible. Finding one with a clean, even silver dial and intact markers in good contrast is the goal. The swept-seconds hand is period-correct and should move smoothly, not in a halting tick, which tells you something about the condition of the movement underneath.
From the Catalog
Hamilton's 1962 catalog described the Thinline 4002 as offering handsome styling and exceptional value, with the slim profile made possible by ultra-thin design and compact engineering. It retailed at $85.00 with a bracelet, or $75.00 on a strap, and was marketed as shock-resistant, anti-magnetic, and weatherproof.
Hamilton Catalog Images
1962
1963
1964
What to Look For
| Dial | The silver dial with painted black markers and no numerals is visually clean but unforgiving. Look closely for fading, spotting, or discoloration around the center and along the marker edges. Any silvering loss or moisture damage will be immediately obvious given how minimal the layout is. |
| Crystal | These round cases typically wore acrylic crystals. Check for deep scratches, crazing, or a cloudy appearance that dulls the dial beneath. A scratched crystal can be replaced, but confirm the correct diameter is used so it seats properly. |
| Movement | Ask about service history on the caliber 687. The click spring in this movement is prone to dislodging during cleaning, and dried oil at this age creates enough friction to stop the watch entirely. A movement running smoothly today may not mean it was recently serviced, so knowing when it was last apart matters. |
| Case | The 10K yellow gold-filled case should show a warm, even tone. Check the lugs and case back edges for wear through to base metal, which shows as a dull gray underneath the gold surface. Light wear on a GF case is normal for a watch this age, but heavy wear-through affects both appearance and long-term durability. |
| Crown | The crown should screw or pull out cleanly and wind with consistent resistance through the full rotation. Slipping, looseness, or rough feel can indicate a worn stem or crown, both of which are serviceable but worth factoring in. |
The Movement
The caliber 687 is a 17-jewel manual-wind movement built to Hamilton's specifications for slim, everyday-wear watches. It winds from the crown, sets simply, and when properly serviced runs with reliable accuracy. The swept-seconds hand noted in Hamilton's original marketing comes from this movement's design, and watching it glide rather than tick is one of the small pleasures of a well-running 687.