There are 2 versions of the Mark 2. 1966-1980 it had an adjustable power knob. 1981-1986 it had no adjustable power knob.
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
Crosman made a V-350 from 1961 - 1969. I do not believe they made an I-350.
Crosman started making the Raven's in 2008.
You have 2 choices. First of all, Crosman airgun owns the Benjamin and Sheridan line of rifles and pistols. Crosman offers a service to locate repair shops that repair older Crosman, Benjamin and Sheridan airguns. Or you can contact one yourself See the 2 links below
Mark Evanier is 59 years old (birthdate: March 2, 1952).
Mark Shulman is 49 years old (birthdate: April 2, 1962).
Mark Evans is 55 years old (birthdate: March 2, 1956).
Mark Kermode is 54 years old (birthdate: July 2, 1963).
Mark Harmon is 65 years old (birthdate: September 2, 1951).
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)