A couple clarifications are in order : When Peterson put Country of Origin stamps on their shanks (occasionally they didn't bother), these changed over the years.
Since 1949 they've used "Made in the Republic of Ireland." This makes their pipes made previously to the change-over the "Pre-Republics" you see mentioned. (I.e., up through and including 1948).
The Savinelli firm has been around forever, but they didn't start making their own pipes until around the 1950s ; previously, "Savinelli" pipes were house brands made by Brebbia (and before that, probably Barontini).
Peterson's older classic shapes have been mainstays in Yak's racks since the 1970s and are still going strong. Their generally smaller sizes (around group 3-4) make their apples, billiards, BDs &c. ideal flake pipes.
The "break-in" problems people complain about are, as nearly as I can determine, from a cost-cutting move they did and -- people say -- they've stopped doing in response to complaints. This was dipping the stummels in stain rather than staining the outsides of them, which made smoking them like smoking drain cleaner until it finally caked-over.
The solution to that, if you've gotten an old-stock one, is to (scrape it down to wood if it's caked,) fill the chamber with cotton balls, dribble alcohol into the cotton to dissolve the stain, and replace daily until it's all out. Dry for a day, and you're good to go. Use a medicine dropper and be very careful you don't get any on the outside or you'll ruin the finish.
Google up "dating peterson pipes" and you'll find some info. I'm too lazy to look it up.
FWIW
:face: