Drop doesn't necessarily mean its an orphaned suit jacket. I have a number of odd jackets that show a drop.
If it's PZ Sartoriale definitely it would be worth the pick up. If it's ordinary PZ, YMMV. More active voices may have better knowledge of the second hand PZ market than me.
Trying to move anything Pal Zileri on eBay for even a fraction of what it's worth is a frustrating experience indeed. A bunch of rubes on that site, I tells ya.
I've been meaning to post every time someone writes something like that, so don't take it personally (and don't let it detract from your solid haul): Guys, working cuffs aren't all that uncommon on casual coats. I've found them on a bunch of cheap stuff - even a (pre-SF) BR coat of mine has them.