It is pre-1935 going by the name, they stated making mouse traps in 1906. Somewhere in this period, although they started to phase out traps around 1910.
Yep,, that's a good one. It doesn't look to have been bloodied. It is in mint condition and the lettering is very clear. If it were a coin I would give it an MS60 grade. However,, if you're going to use it, load it with peanut butter.