T-3 head light date code

[Mr. Chevy]

This is an original T-3 headlight in good condition. Orange inked stamped numbers are at top of bulb on backside. On my particular light they read, first line "L", second line "6012", can't make out the third line stamping just a number "6" and then "12v" on the fourth line. There is also a raised stamped series of numbers under the prongs they are, "162", "013". Unknown what these mean.. Hope this helps.. Photos came out crappy but it's like trying to photograph into a mirror..

Rich