Vintage '50's Mach Airspeed Indicator, F-86 SABRE Jet Aircraft
-Kollsman Inst. #1952B-4-03

This was purchased from the grandson of an early jet aircraft mechanic who told him  he got it from an F-86. Introduced in 1949,the F-86 was discontinued in 1959 by the USAF but continued in use by the Navy as a carrier jet. As noted below the Bolivian Air Force used them until 1994! The sticker indicates this was refurbished in 1962.
It appears Kollsman used the date of manufacture as a part number. If that's the case, this dates from April 3,1952
From Wikipedia-

The North American F-86 Sabre, sometimes called the Sabrejet, is a transonic jet fighter aircraft. Produced by North American Aviation, the Sabre is best known as the United States' first swept-wing fighter that could counter the swept-wing Soviet MiG-15 in high-speed dogfights in the skies of the Korean War (1950–1953), fighting some of the earliest jet-to-jet battles in history. Considered one of the best and most important fighter aircraft in that war, the F-86 is also rated highly in comparison with fighters of other eras.[6] Although it was developed in the late 1940s and was outdated by the end of the 1950s, the Sabre proved versatile and adaptable and continued as a front-line fighter in numerous air forces.


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