I have a receiver I am interested in identifying. I have placed it as either a Winchester or a Rossi copy of the Winchester pump .22 that first appeared in 1890. The next permutation was in 1906 and there is a 62 as well. The bluing is in such great shape I would guess the last model change, but is it Winchester or Rossi? There is a capital R in a square stamp inside the receiver wall. Is that a Rossi symbol or an unrelated inspectors mark? Are the 62 and 62A recievers interchangeable? Are Rossi and Winchester parts interchangeable?