A Jaroslav Svoboda limited edition studio glass Dr Joseph Petzval medal, the clear circular body with blue casing, engraved to one side with two lenses in a concave recess, engraved marks and signature, height 14.3cm, cased and with numbered certificate, together with a framed black and white photograph by Margaret Harker Farrand of St Paul’s Cathedral, London, circa 1952, 24cm by 19cm, within a painted frame. Note: this Dr Joseph Petzval medal is believed to have been awarded to Harker Farrand for her work in the field of photography.