Onbekend - Kristalontvanger -Cristal receiver ラジオ - Multiple models

Two crystal receivers, brand unknown, model Kristalontvanger - Cristal receiver, in good physical condition and not tested, comprising a round black bakelite model (5 cm high, 10 x 10 cm, 150 g) and a rectangular brown bakelite model (12 cm high including coil, 10 x 12.5 cm, 160 g) with an extra coil, total two objects.