A Secretan 10-cm reflecting telescope No. 40. On nummer indication we can date the telsecope circa 1880. The telescope is in original and good condition with the 10-cm reflector, is complerte with a brass dust cap, finder and finder-alignment mechanism. The weighty dust cap with bayonet pins and crudelycut slots to retain it. The mirror has a flat back and a metric diameter of 10 cm. The focal length will be expected 60 cm. The reflecting prism has approximately-square entrance and exit faces of 11 à 12 mm sides.
