S was used from mid 1958 to mid 1959. In NIB condition it should be worth around $400.
There is a Marlin 336A with scope currently for sale on Gunbroker.com (September 07, 2008.) It is advertised as never fired, new in the box in 30/30 Winchester caliber. It has a "buy it now" price of $349.00
350-400 dollars.
That is the Marlin proofmark, showing the gun to have been test fired with a high pressure "proof" load. It stands for the initials of the founder of the company- John marlin.
The Marlin Model 9 is also known as the "Camp 9". It fires the 9mm Luger cartridge. It is a semi-automatic firearm loosely modeled after the .30 carbine used in WWII. It also came in a Model 45 version or Camp 45 which fired the .45ACP cartridge. Both of these guns are no longer made by Marlin.
$165
100-700 USD
What is the condition, and what are the features? I've seen these guns go from as little as $35, to $200 for a excellent std. model. I've also seen deluxe engraved versions go for many times that amount. One thing you should be aware of; Marlin sent out a notice that these guns should not be fired, so they are basically wallhangers.
50-500 usd
The winchester 25-35 Cartridge CAN be safely fired in a 25-36 Marlin caliber firearm. They are similar cartridges, the Marlin is a bit longer. For that reason the Marlin ammo cannot be fired in the Winchester.
Manufacture date 1954
less then $300.00
The Marlin Model 1881 was Marlin's first lever action rifle. It fired much more powerful loadings that the Winchesters and it beat Winchester's Model 1886 to the market by 5 years. Condition is everything in antique guns. If it has been refinished, the collector value is very low. If it is in original condition with the expected level of wear but not abused it could get upwards of $2000. THe Model 81 was a .22 cal. bolt action rifle with a tube magazine. It was superceded by the 881 and the the 981. It sells for around $100-200, depending on condition. A good average price is 150-175