Hi Shane.
Referring to this resource site,
Marlin Serial Numbers Dates Of Manufacture
the single 'K' at the start indicates your piece was manufactures in 1953 - almost old enough for Social Security now :-)
Cheers
D
SOURCE: I'm trying to see what year my marlin lever action rifle is.
1883
Found here:
http://oldguns.net/sn_php/marlinlookup.php
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