Likely 1958 (wooohoo! that's a good year) although there have been some Light 12's seen with the same prefix that were made in 1968. I don't know if the Sweets did the same thing.
Another thing I found out about the 68 and later guns, is that the fasteners in the holes in the bottom of the frame shown below are rollpins, in 50's guns they're screws. (Thanks Jeff, rer, and A-5 Guy)
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