The JC Higgins Model 45, chambered in .35 Remington, was produced during the 1950s. The serial number can help determine the specific year of manufacture, as these rifles were made by High Standard for Sears. Generally, you can obtain a more precise date by consulting specific serial number charts or resources dedicated to JC Higgins firearms.
Your rifle was made by Marlin for Sears, but used a different serial number sequence, making it difficult to date it precisely. The JC Higgins name was only used on the model 45 from 1958 to 1961. By the way, that is a really good deer rifle.
your marlin model 336A was made by marlin in 1950.
Your Marlin model 336CS(Carbine Sporter)was made in the year 1987.
Marlin
with the prefix letter c it was made in 1982 or 2008.
Remington Model 550-1 does not have serial numbers.
The JC Higgins Model 45, chambered in .35 Remington, was produced by High Standard for Sears from the late 1940s to the early 1960s. The specific serial number U23915 suggests it was likely manufactured in the early 1950s. To determine a more precise age, it is essential to reference specific production records or guides that correlate serial numbers with manufacturing dates.
It is a Marlin 336 carbine as made for Sears.
The AA prefix to your serial number dates your marlin model 336 RC(regular carbine) to the year 1965.
1955.
1968
1950