Beretta made a bunch of 391 variants.
Basically, the extra money goes into things like furniture (nicer wood, more stock adjustment options), finish (the prettier, the more expensive), and other assorted things. Same basic action, but prices can vary wildly.
Kind of the same reason the Chevy Tahoe, GMC Yukon, and Cadillac Escalade have such a variance in price- same basic vehicle, exact features will vary along with price.