RE: "Dynamite" sandwiches
I grew up in Warwick in the 60s/70s and when I heard of dynamite sandwiches here I equated them with the old, home-made, pre-Manwich sloppy joes. Never saw dynamites in Warwick, I certainly don't see them in Boston or Metro South where I live.
I work in Westborough with a lot of folks from Bellingham, Franklin, Woonsocket and the environs. The only ones I've asked who've ever heard of dynamite sandwiches are those who lived in Woonsocket 20 or more years ago. A guy who moved to Woonsocket from the Midwest 5+ years ago (and has a Sister in Bellingham) swears I'm making it up.