The Solitaire Doué exists regularly with a gold-plated cap in the model sizes 144, 146, 163, 164 and 165, each with thread-guilloched decoration; the 144 has the ID number 03495-98 or 14144 with a list price around 535 euros. The gold-plated variant is mainly known from the Bordeaux writing instruments, on which the cap is of gold-plated sterling silver and the body of dark-red precious resin; a black-body variant with gold-plated silver cap is rarer. The meaning of the imprint 'Metal 2' on the clip ring is not finally clarified in the collector circle.