The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
London. National Gallery. The Guitar Lesson. Woman Playing Guitar. Terborch. B. Matthews
The Guitar Player. Vermeer. No. 62. The Iveagh Bequest
Firenze. Galleria Uffizi. Child playing the guitar. Nova Lux. P. Marzari
Firenze. Angel Playing a Guitar
Still Life and Guitar. Pablo Picasso. Soho Gallery. Soho Card 373
National Gallery. Guitar Lesson. Terborch. Card No. 1157. Trustees by Waterlow
Guitar. R. E. B. Postcard