You are looking at several used spare parts for a vintage Poseidon Cyclon regulator.  

Parts include an incomplete second stage (purge , mouthpiece and diaphragm are missing), two LP pressure hoses (connects 1^st to 2^nd stage), a first stage (state unknown and marked/etched by original owner), an A clamp adaptor which is missing the screw (marked/etched by original owner) and an adaptor to convert Poseidon threads in the first stage to a standard thread.  Please see the photographs.  I am also currently selling a complete Poseidon Cyclon on e-bay, these parts were bought with the view of restoring that.  

Postage is at cost as I am using scrap packaging but the package weighs just over 1.5 kilo, hence the high postage costs.  UK 2^nd class small parcel £2.90, European Airmail £12.30 and the rest of the world £19.60.  

Thanks for taking the time to look and if you decide to bid, good luck in the auction.