I own the same Marlin. It’s the original configuration from when the Marlin/Remington collaboration first designed the 444. Lasted from the mid-60’s until 1970 when Marlin did a redesign by shortening the barrel and changing the stock.
These originals are exceptionally well made firearms and very accurate, I load mine with a close to maximum charge of H4198 and a Hornady 265 grain FP. Mounted a period Nikon 2x7 scope. It groups 3 shots at 100 yds into an inch and a quarter with boring regularity. Functions like a Swiss watch.
