Big Iron
This thread stems from another "Forum" where I dated the McCoy .35 in question there as being produced in 1957. Now the reference manual in question is The American Model Engine Encyclopedia. It states that engines prior to 1957 had bolt on front cases. In 1957 they changed to the new case without the bolt on front end. I did not write the book nor did I offer an opinion of my own. I just put out the info as is stated by "AMEE"
Doc the answer to your question is yes, the reference manuals can be wrong, no one is infallable. That is why I did not comment on your particular engine one way or the other. I just dated the engine in the thread by what is in the book. no more no less.
"Bill Gruby"