The pistol has an exposed hammer, however no safety that I can tell. It's possible I'm not looking at the hammer properly?
You looked at it correct... I typed the description wrong.
It's a .32 Double Action 2nd Model.
Serial numbers ran from 31 in 1880 to 22172 in 1882.
model 15 (8K55xxx).
8K55xxx = 1975.
K218xxx = 1954 and would be a K-38 Masterpiece. It became the model 14 when S&W began assigning model numbers ~1957.