The crossover lists show that it's a Mossberg 340K. They were made between 1958 and 1980 with the later ones marked 341 according to the Blue Book.
Last year's Blue Book shows prices of 100%=$125 and 95%=$80.
It was looking like a passable deal, if the scope works, until I got to the word pitting in the ad. Hard to tell how bad it really is.
JT