Is it JM stamped? Before the Remington acquisition. Makes a difference in folks looking for a Marlin. Other than that Gunbroker is your friend. Create an account and sign in then you can search completed auctions and see what they are selling for. Good luck.
Buckster it is stamped. Look at the barrel near the receiver. You should see a JM in a circle and that is the proof mark. What you have is a pre safety JM stamped marlin 336 carbine in 30-30.