: Widely considered the "gold standard" for serial number research based on original factory records. Book Resource High Standard Firearms History 1932 to 1984 Connecticut by John G. Curry is the most authoritative print guide. Key Specifications .22 Long Rifle (LR) Straight blowback, single-action with external hammer Barrel Lengths 4.5 inches or 6.75 inches (heavy target style) 10-round detachable box with heel release Adjustable rear for windage and elevation Collector's Perspective High Standard Model H-D Military
| Serial Number Start | Approx. Year | Critical Feature | | :--- | :--- | :--- | | 125,000 | 1948 | Blue finish, dog-leg hammer, slotted bushing. | | 140,000 | 1949 | Parkerized finish appears. Micro rear sight optional. | | 152,000 | 1950 | Straight spur hammer becomes standard. | | 168,000 | 1951 | Last commercial batch. Transition to M101 parts. | histandard model hd military serial numbers best
The was produced between 1946 and 1951 (extending to 1955 for some variants). Identifying these pistols requires distinguishing between civilian and military-contract versions based on their serial numbers and specific roll-marks. Serial Number Ranges & Production Dates : Widely considered the "gold standard" for serial