I found on the web site below, that a 336 Marlin with the serial number that begins with a "P", was manufactured in 1957. http://oldguns.net/cgi-bin/f2f/f2f.pl?http://oldguns.net/q&a1_05.htm
Usually on the bottom tang, underneath the lever. Some later 39a's have it on the top tang, behind the hammer.
Should date to 1983. First two digits (17) from 2,000=1983
Serial number records for Marlins built after 1906 are not recorded. At WWI Marlin Firearms Co. was sold, and again after WWI, so serial numbers were started over, with prefix letters. Your gun could be from anywhere between 1922, and 1935, but with the B prefix, and tang marking of "Model 1893", I'd guesstimate it to be in the earlier part of that range.
The serial number by itself doesn't identify a specific model.
The model 336SC was manufactured from 1949 to 1963.
please include the model number,then you might get a answer.
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