I have a wonderful and original Ryan Duplex Tandem for sale.  This bike is in excellent original condition.  Needs nothing.  21 Speed Deore LX Derailleur/Brakes with Specialized Cranks. Sun Rims 26" rear and 20" front (no odd tire sizes).  Additional Drum brake on rear hub.  Highly adjustable - I am 6'3" and my stoker is 5'3" which works fine but is about the limits for tall on front.  Can adjust the front for shorter rider and rear for taller rider.
 
Pictures available or you can view it/ride it in NE Plano, TX
 
Typically I hate to sell it but we just aren't riding enough to justify keeping such a lovely machine in the garage.  Bike comes as you see it (minus pedals).  It's a super comfy ride with underseat steering and shifting.
 
I can box and ship insured anywhere in the US.  Estimate shipping at $250-300 due to size.
 
Please contact me via email - kr@kentrobinson.com or cell 214-244-4494 if you would like to talk.
 
Kent Robinson
Dallas, TX