The Mark II BB/177 pellgun was made between 1981 - 1986
Go to ( See the link Below) and find your parts and owners manual for your gun or rifle. Crosman keeps a web page for older airguns.
I occasionally find them at gun shows. But the Mark1 only requires a common 12 gram powerlett to work. This can be found anywhere. The Gold ones are just a color. They is nothing different between them and a silver one.
It all depends on the condition of the pistol. Unfortunately you did not give that needed information in order for me to give you an estimate of value. You need to give it some sort of rating like Poor, Fair, Good, Very Good or Excellent condition. Or something like that so I can give you an estimated range of value..
CROSMAN MARK II The first Variant was made between 1966--1980 Second Variant (Without adjustable power) 1981-- 1986
first variant single shot mfg 1966-1980. second variant (without adjustable power)mfg 1981-1986
The Blue Book of Air Guns lists the Mark 1 Ruger in excellent condition with box in the range of $110 to $137.50 if it has adjustable power and 10% less if it does not have adjustable power. It is hard to know the integrity of the seals on a gun this old without testing it. I would suggest testing it to get the full value.
The Mark II was made between 1966-1980 then came adjustable power made between 1981-1986. It's current value is Apx: 100%=$135, 90%=$85, 60%=$50
First variant: It was made between 1966 and 1980 it had adjustable power knob. Second variant: had no adjustable power Mfg 1981-1986.
This model was made between 1966 to 1983 in fair condition it is worth between $45 - $70
What is the condition of the Crosman? No estimate can be given without knowing the condition of the Crosman. Excellent (Like new) GOOD (Very good condition) Fair (Shows use) Poor (Well used may be nonworking)
( See the link below.) They have parts and possibly repair service
The Mark II was made between 1966-1980 and had an adjustable power setting. In 1981-1986 the adjustable setting was removed. The second model is worth less than the first model. In order to give an estimate of value I need to know the condition of the gun. Is it still working? What condition is it in. Excellent, Very good, good, fair or poor?