There was no Owners Manual back when the Model 60 was made between 1931 and 1934.
At most, it would have had a Winchester string hang-tag on the trigger guard with the place for the dealer to write the price, and "pull the trigger to get the bolt out for cleaning", or some such "instructions".
Back in those pre-lawyer behind every tree waiting to sue somebody days, they figured everyone was bright enough to operate a single-shot bolt action .22 rifle without publishing a book about it.
PS: Don't waste a phone call to Winchester.
That was about five companies ago, and the present company will only laugh at you!
rc