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I'm simplifying, in the early 60's Marlin started the "Glenfield Products" line for chain stores to be the more budget line as opposed the the Marlin name reserved for dealers. The rifles are identical function wise just birch wood for stocks instead of walnut. Most even have the "JM" stamp on the barrel. I have a Marlin 80G stamped Glenfield Products which is from 1960 or 1961 because it doesn't have a serial number and in 1962 there are date codes for month/year of manufacture stamped on the barrel. My Marlin 80G became the Glenfield 25 in 1966 when the Marlin Glenfield Products, became the Glenfield line.
Are you sure yours isn't stamped Marlin 36G? How do you know the stock is Walnut? Does it have the Marlin bullseye in the toe?
The Marlin 36G Glenfield Products was produced 1964 and 1965, which coincides with your "Z" prefix on the serial number. In 1966 it became the Glenfield 30. They are the same as the Marlin 336 with exception of the furniture, front sight and the shorter magazine tube.

Are you sure yours isn't stamped Marlin 36G? How do you know the stock is Walnut? Does it have the Marlin bullseye in the toe?
The Marlin 36G Glenfield Products was produced 1964 and 1965, which coincides with your "Z" prefix on the serial number. In 1966 it became the Glenfield 30. They are the same as the Marlin 336 with exception of the furniture, front sight and the shorter magazine tube.