Courtesy of Mr. Marrock on the forum, this marvellous piece of field equipment has been brought to our attention, more information from

“The Swiss Mikiphone, circa 1930, is probably the best of all the miniature gramophones produced in the first half of the twentieth century. The folding pocket gramophone when closed resembles a large pocket watch. All the parts apart from the winding handle are stored inside the case which when closed has a diameter of just 4.5″ (11.5 cm) by under 2″ thick (4.7 cm). The turntable is only just over 4″ in diameter (10.4 cm) and the records are held in place with a push on clamp. The celluloid ‘horn’ is in two parts and is also stored within the case.”