Cyclo Oppy Solo Rear Derailleur: 3-Speed - 1930's 1940's (Near Mint+ Low Miles)

This VERY tough to source rear mech was made in England from the pre-war era in 1938 to 1949.  It is a smaller, lighter, more efficient than the more common Cyclo Standard rear derailleur.  The Cyclo Oppy is a lighter, shorter version of the Cyclo Standard. It has an integral chain tension spring and the mounting bracket is slightly canted forward to give a smoother cable run. It was designed for medium ratio solo bicycles (via Disraleigears)

The Oppy was named after famed Australian long distance cyclist Sir Hubert Opperman.  It's name includes "Solo" referring to this designed for single person bicycles and not tandems. It also was available in a 4 speed version that featured a different lower jockey wheel.  See attached catalog scans for instructions and setup details.

Condition

Near mint or better with very low miles! It almost looks NOS. There's some dried grease/dirt around bolts/nuts but I don't see any cosmetic wear. Show bike worthy as it is, or clean it up to be show worthy for NOS bikes!

*SOLD AS-IS. I do not have the knowledge base on these early derailleurs to ensure that everything is present and in working order. I have compared to catalogs when possible though.  Enjoy the lower than market value prices knowing there won't be refunds available on these. I've done my best to show everything at various angles in the photos, study them carefully.