I'm also sure it was a Model 15, had the adjustable rear sight, but no barrel under lug of the Model 19.
T.S. is right the book is WAY better than the movie, if not a little dark. Mrs. Chief was having a fling with the out of town shark pro.
Yeah, she used to date his older brother, too. The characters in the book were classier than in the movie. I used to know a guy who I imagined the icthyologist looked like. No way did I imagine him looking like that little jerk Dreyfuss. I can't say here why I think Spielberg cast some roles, if not most.
The chief's wife invited the shark expert to dinner and Brody was out of his league in studying the wine labels. His wife came from a higher strata of society than he did, and she sometimes felt that she'd married beneath herself.
I was pretty amused when Brody saw that one wine was a famous white burgundy named
Le Montrachet. He pronounced it as Mount Rachet!

I'm quite sure the wife was younger and prettier in the book. I was very disappointed in the casting, apart from Brody and Quint.
Did any of you recognize the cameo role of Peter Benchley as a TV reporter on the beach?
BTW, the book warned about restaurants serving fake scallops that were really just punched-out globs from fish. I've been cautious about that since, although Red Lobster here never cheated me that way. The practice may be more common back East, the book and movie being set on Long Island.
Scallops aren't fish, nor are oysters. What are they; gastropods? Been awhile since college Biology 101...
Anyway, read the book and Benchley's other novels. He was a quite good writer.