I don't believe that Crosman ever made a model 5100. (But I may be wrong.) I've searched all my catalogues and references and can not find any information on a model 5100. They did sell a model 6100, it's a Dianawerk model 45 from 1982-88. Check you numbers again.
Crosman says It was produced between 1954 and 1956
That was made for Sears by Crosman, and I dont know of any published lists on those. You might contact Crosman for further information.
1941-1948, It then changed to model 311
It was made between 1956-1967
Between 1931 and 1941.
Between 1954 to 1956
Crosman never made a .22 cal BB rifle. They made several .22 Cal Pellet rifles over the years. Several are still in production.
The "First model Rifle" was made in 1923. The first gun was around 1947.
The trap Master was made between 1968-71. However Crosman doesn't publish how many units were made. I suggest you contact Crosman directly and ask them. Contact Crosman "Contact Information" at the link below.
It was made for Western Auto by Crosman between 1966-70
Crosman made a V-350 from 1961 - 1969. I do not believe they made an I-350.
Crosman does not own Marksman. Crosman made a Repeatairmodel and Marksman made a Repeater model. See the link below for the Marksman Repeater owners manual.