I agree, James K. And that's what I saw on the rifle I looked at, as related in my original post-though, in reference to wachtellhund1's post, Model 88 rifles were also "heavily stamped" with the caliber (.358) but, to my recollection, without mention of the model number (at least in the speciman that I examined).
So was it stamped or not? I did a quick Google search and there are no records of a Win 100 being produced in .358 Win. But now I have to eat my words, as I came across this auction last year. Appears the auction was closed, reserve not met. It was a Win 100 in .358 Win, one of the pictures show the barrel stamping. http://www.gunauction.com/buy/109143...n-.358-caliber