Accumatic IV
1958–1960 · Stainless Steel · Automatic
About the Accumatic IV
Made from 1958 through 1960, the Accumatic IV runs on Hamilton's caliber 672, a 17-jewel automatic housed in a 33mm stainless steel case. It's part of the Accumatic family, Hamilton's line of automatic watches that leaned on Swiss-made movements during the brand's transitional years. The dial design is what makes this one memorable: a flat center section gives way to a wavy, textured outer circumference with a pearled minute track, embossed silver numerals at 3, 6, 9, and 12, and luminous dots rounding out the layout. The result is a dial with real visual depth for something this modest in size.
Finding one with the original dial intact is the first thing to check. The textured outer track and embossed numerals can look rough if the watch was mishandled or stored poorly, and the luminous material at the dots ages unevenly. Two dial versions came out of this production run: a white dial as shown in the 1958 catalog, and a black dial version that followed in 1959 and 1960. The black dial is a bit harder to come across and tends to attract collectors who want something with a little more contrast.
From the Catalog
Hamilton listed the Accumatic IV in 1958 at $69.50, marketing it as a waterproof stainless steel automatic with white embossed numerals and markers, luminous dots, and a pearled minute track. For context, that price put it in the middle of Hamilton's automatic lineup for that year, accessible but not entry-level.
Hamilton Catalog Images
1958
1959
1960
What to Look For
| Dial | Look closely at the textured outer track and the embossed numerals. The wavy texture can trap grime or show damage that's hard to spot in photos. Luminous dots oxidize and discolor over time, which is expected, but check that none are missing or have been touched up. |
| Crystal | The Accumatic IV uses an acrylic crystal. Light scratching is normal on vintage examples and can usually be polished out, but deep gouges or crazing mean it needs replacement. Make sure it's sitting flush with no separation at the edges. |
| Movement | Ask about service history. Dried lubricants are the most common problem on unserviced examples and will create enough friction to stop the movement entirely. The watch should run smoothly and the sweep seconds hand should move without stuttering. |
| Case | The stainless steel case wears well, but check the case back. The slots in the back ring are small and don't always accommodate a case wrench easily, which means some previous owners or unqualified shops may have marred the slots trying to open it. |
| Crown | The crown should pull out cleanly and return to the winding position without resistance. Also note: even though this watch was originally rated waterproof, that rating does not apply to a vintage example. Keep it away from water. |
The Movement
The caliber 672 is a Swiss-made 17-jewel automatic that winds via a rotor rather than manual winding, though it does accept hand-winding through the crown. One thing to know: when you wind the 672 manually, the crown engages the rotor, which is normal for this movement but can feel unfamiliar. It's a solid workhorse, though dried lubricants from years of sitting will create enough friction to stop it, so service history matters on any example you're considering.