https://auction.potterauctions.com/online-auctions/potter-potter/henning-doug-1947-2000-fu-manchu-duck-vanish-from-doug-8801583
HENNING, Doug (1947-2000). Fu Manchu Duck Vanish from Doug ... sold at auction on 8th June | Potter...
https://auction.potterauctions.com/online-auctions/potter-potter/henning-doug-1947-2000-paul-curry-sliding-knot-califor-8801585
HENNING, Doug (1947-2000). Paul Curry Sliding Knot. Califor... sold at auction on 8th June | Potter...