Hamilton Pocket Watch Serial Numbers
The serial number on a Hamilton watch is stamped on the movement, not the case. Open the back of the watch carefully to find it. Enter it below for an instant result.
Serial Number Table — Hamilton 1893–1942
| Year | From Serial | Year | From Serial |
|---|---|---|---|
| 1893 | 1 | 1918 | 2,200,001 |
| 1894 | 10,001 | 1919 | 2,400,001 |
| 1895 | 40,001 | 1920 | 2,600,001 |
| 1896 | 70,001 | 1921 | 2,800,001 |
| 1897 | 100,001 | 1922 | 3,000,001 |
| 1898 | 200,001 | 1923 | 3,200,001 |
| 1899 | 300,001 | 1924 | 3,400,001 |
| 1900 | 400,001 | 1925 | 3,600,001 |
| 1901 | 500,001 | 1926 | 3,800,001 |
| 1902 | 600,001 | 1927 | 4,000,001 |
| 1903 | 700,001 | 1928 | 4,200,001 |
| 1904 | 800,001 | 1929 | 4,400,001 |
| 1905 | 900,001 | 1930 | 4,600,001 |
| 1906 | 1,000,001 | 1931 | 4,700,001 |
| 1907 | 1,100,001 | 1932 | 4,800,001 |
| 1908 | 1,200,001 | 1933 | 4,900,001 |
| 1909 | 1,300,001 | 1934 | 5,000,001 |
| 1910 | 1,400,001 | 1935 | 5,100,001 |
| 1911 | 1,500,001 | 1936 | 5,200,001 |
| 1912 | 1,600,001 | 1937 | 5,300,001 |
| 1913 | 1,700,001 | 1938 | 5,400,001 |
| 1914 | 1,800,001 | 1939 | 5,500,001 |
| 1915 | 1,900,001 | 1940 | 5,600,001 |
| 1916 | 2,000,001 | 1941 | 5,700,001 |
| 1917 | 2,100,001 | 1942 | 5,800,001 |
Notable Hamilton Pocket Watch Grades
| Grade | Size | Jewels | Adjusted | Notes |
|---|---|---|---|---|
| 940 | 18 | 21 | 5 positions | Common railroad grade |
| 946 | 18 | 23 | 5 positions | High-grade 18s |
| 947 | 18 | 23 | 6 positions | Rare, very valuable |
| 950 | 16 | 23 | 5 positions | Top 16-size grade |
| 992 | 16 | 21 | 5 positions | Most common Hamilton RR |
| 992B | 16 | 21 | 6 positions | Last & finest version |
| 993 | 16 | 21 | 5 positions | Open face, rare |
| 999 | 16 | 19 | 3 positions | General purpose |
Three Numbers, Only One of Them a Serial
Hamilton owners have an extra trap to avoid, because there are usually three numbers in play rather than two. The one that dates the watch is on the movement, engraved on the plate beneath the balance, generally near the words Hamilton Watch Co. Lancaster, Pa. A second belongs to the case, and the quickest way to recognise it is by the company it keeps: Hamilton bought cases in, so that number sits beside somebody else's trademark — Keystone, Wadsworth, Philadelphia Watch Case Co. and Star are the names you will meet most often. A number accompanied by a trademark that is not Hamilton's is a case number, whatever else is stamped around it.
Hamilton sold movements and cases separately, as every American maker did, so the two numbers were never intended to match and a difference of several years between them is completely normal. There is a third number to be careful of as well: the grade number — 992, 950, 940 and so on — is also stamped on the movement, and is often mistaken for a serial. Grade numbers are three digits; Hamilton serial numbers run to six or seven. If the number you are looking at is short and appears in the grade table above, it describes the model, not the individual watch.
The Watch of Railroad Accuracy
Hamilton arrived late — the company was founded in Lancaster, Pennsylvania in 1892 on the remains of the Keystone Standard Watch Company — and built its reputation almost entirely on railroad-grade watches. By the early twentieth century The Watch of Railroad Accuracy was the company's slogan and, unusually for advertising, a fair description.
The railroads set genuinely demanding standards after a series of collisions caused by inaccurate timekeeping: an approved watch had to be at least 17 jewels, adjusted to five positions and to temperature, lever-set so it could not be reset accidentally by the crown, open-faced with an Arabic dial, and accurate to within thirty seconds a week. Hamilton's 992 became the archetype and probably the most widely used railroad watch in America.
Its successor, the 992B, is the one collectors chase. Introduced in the 1940s and made until the end of American production, it used an Elinvar Extra hairspring — an alloy far less affected by temperature and magnetism than steel — and is generally considered the finest railroad-grade watch the United States produced. A 992B in honest condition remains a genuinely accurate timekeeper today, which cannot be said of most watches of its age.
Hamilton's other wartime distinction is worth knowing: its Model 21 and Model 22 marine chronometers equipped the US Navy through the Second World War, and the company effectively took over chronometer supply for the Allies when European sources were cut off.
Watches Made After 1942
The table above runs to 1942, and there is a reason. Hamilton's civilian numbering became irregular during the war, and pocket watch production afterwards was dominated by the 992B, made in comparatively small batches until 1969. If your watch dates beyond the end of the table, the serial number alone will not place it reliably.
Look instead at the movement markings. A grade stamped 992B, 950B or 4992B is by definition post-war. The 4992B is the navigation and military model, usually with a 24-hour dial and a sweep or centre seconds hand — these were made in quantity for the armed forces and are common, so the military association adds less to the price than owners often hope.
From Date to Value
Having a year is the easy part. A 992B and a 17-jewel general-purpose movement from the same period are separated by a wide margin, and nothing in the serial number signals which of them is sitting in your hand.
Those are grade above all — use the table above, since on a Hamilton the grade number does most of the work; the case metal, with solid gold well ahead of gold-filled or base metal; originality, meaning an unrestored dial with no hairline cracks, correct hands, and a movement that has not been re-plated or over-polished; and running order, because servicing a 23-jewel adjusted movement properly is an expensive job.
One caveat specific to Hamilton: production fell sharply through the Depression years, so serials from roughly 1930 to 1935 were issued across much longer stretches than usual and dates in that band are correspondingly loose. Elsewhere, treat a result as accurate to within a year or two.
The grades and jewel counts reference explains what the adjustment markings mean in practice, pocket watch values covers the wider market, and the appraisal guide sets out when it is worth paying for a written valuation.
More on Hamilton Watches
The Hamilton Watch Company history page covers the Lancaster story from 1892 onward. For the railroad standards that shaped the 992 and its rivals, see the railroad watch guide; Hamilton's wartime work is touched on in military pocket watches.