Browning.com isn't any help either:
Date Historic Information Serial Number Info
1914-1955 F.N. began production of the 22 Semi-Auto Rifle. No serial numbers are available.
1956-1967 In 1961, the codes for calibers were changed:
T=Long Rifle Caliber
E=Short Rifle Caliber
Example: 8T1000 = A 1968 22 Long Rifle Caliber Semi-Auto Rifle with serial number 1000. T=Long Rifle Caliber
E=Short Rifle Caliber
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