Being primarily an old vintage English bike guy and second an old Schwinn lightweight fool, most of what I have is esoteric. That seems to be a defining criteria for my bikes and parts bins.
1975-ish Huret Success TITANIUM RD. The jubilee took the limelite but at 175g the titanium success model is the shiz of Huret RDs. It's not near as delicate as the jubilee.
At one time these were on all English bike nuts want list. A set of these today is very hard to put together. Mainly because not much of this stuff survived.
26" 597 ISO. 1-1/4" Dunlop Special lightweight stainless rims, SA Aluminum case AC 3spd hub, GB teapot wingnuts for SA hubs. Front hub is a Bayliss club special with aluminum flanges. One of these days I need to lace up the front wheel.
The only Schwinn lightweight head badge nobody has ever seen a bike for.
Armstrong steel double fixed flip flop hub 1931. Has an equally rare Villiers 20t freewheel on one side.
I could go on but I can't unpack all my junk. I just put it all away last week.... 😄