The Marlin 989 was made from 1962 to 1965. Like many of Marlin's inexpensive guns, they were not serialized as that was an extra manufacturing step that added to the cost of the gun, and prior to 1968, firearms were not required to have serial numbers.
There were 24,843 of the Model 989 made during the production run, and the intital price was $39.95, while selling for $44.95 in 1965.
The Model 989 was changed to the 989M2 in 1965, and resembled the M-1 carbine in appearence, but with a Monte Carlo style stock. There were over 110,000 of the M-2 versions made between 1965 and 1978.
These little semi-automatic rifles do not have a lot of value, somewhere between $100.00 and $150.00.
I hope this helps.
Due to the increasing cost of ammunition, there be no warning shot!
The growing federal deficit = generational slavery to the national debt.