First....if its a pre safety.........(pre 1983) you'll be GTG......
even built after 1983 with the stupid X/bolt safety....these are keepers also..
Remington bought Marlin 2010 (ish) and started building junk....the serial number of RemLins
will begin with 'MR' Marlin/Remington..AKA RemLins
Remington's first 5 yrs or so were the problem childs....rough/cobby/poor fit & finish/crooked sights
Read on the internet they are better post 2015......so it must be true
The serial number code normally is...subtract first two from 100...IE...'22' from 100 = 1978 mfg date
study the date code list & that should better explain..
http://marlinspares.com/wp-content/uploads/2012/07/Marlin-Date-codes-ver8-396mb2-1024x791.jpghttps://www.gunvaluesboard.com/marlin-serial-numbers-dates-of-manufacture-1664.htmlhttp://www.lasc.us/FryxellMarlin1894.htmhttp://marauder.homestead.com/files/TUNING_M_1894.htm