You need a gunsmith
The 1T prefix dates your Browning SA to the year 1961.
Best left to a gunsmith
The prefix of 4T indicates that your Browning .22 was made in the year 1964.
It will have to be custom made.
browning.com has sn data under customer service.
My research indicates that the T72 suffix was assigned to the browning .22cal medalist that was made in 1972.
No the meaning of browning bdm means browning detachable magazine,while the browning da means (double action) and sa means (single action) in reference to browning handguns.
This is a Browning .22 auto rifle made in 1968.
It MAY- depends on which Browning and which Miroku. Browning moved production of some firearms to Japan, where they were produced by Miroku- so there IS some relation between them. Really need to check with a gunsmith, or staff at Numrich, gunpartscorp- with their staff.
Your Browning was made in the year 1969.
Your browning lever action 22 was made in 1976.
No such model in the Browning line.