I believe you have a Marlin 35 Cal. Model 336 CS rather than a C5. Look again.
$200.00 us
50-135 USD
No
The value of a Marlin Cal bolt action model 187 gun depends on its condition. This gun in excellent condition is worth between 90.00 and 135.00 as of 2014.
The value of a Marlin model 336 in that condition is 350-400 dollars.
50-100 USD
Marlin 81
Made by Marlin....same as the Marlin Model 80
Made by Marlin....same as the Marlin Model 80
model GA22 ( great american 22 cal) first production 1983 same as marlin model 75C
If it is one of the CB models made in 1999 to 2000 and it is 30-30 cal., it would be worth $1200 to $1400.