T84588 made in 1960, 7T59102 made in 1967, 8T80186 made in 1958
This information is from my reference book "Browning Dates of Manufacture, 1824 to Present" and is listed for the22 Long Rifle Automatic.
From "The Blue Book of Gun Values", all values are the listings for Belgian manufacture, 100% condition:
Grade I, $800, Grade II, $1450, Grade III, $3525
There are also added values for things like wheel sights, initialed or fully signed by the engraver, original boxes, etc.
The BBoGV is a valuable resource and I highly recommend getting one. If you want another good book to have, the Gun Parts Corp. catalog has tons of exploded drawings of just about anything, it seems.