Somewhere around 1969 or 1970 my parents gave me a Marlin 39A topped with a Marlin branded 4x scope (the old skinny tubes) same size as the one in your photo. According to the serial number search, it was manufactured in 1956 or 57.
It is stocked and foreended in heavy walnut. The rifle is a tack driver and will be staying in my collection until I'm gone. I've seen others of this vintage priced at $5-600 without the Marlin branded scope