Pre Heuer MIKROGRAPH. - Swiss made, 1930s - ref. 601 - pat. 73392/93 - nickel case with diameter of 58 mm, including crown 74 mm - case thickness 15 mm - suspension bail - glass has a narrow facet cut edge - pristine enamel dial - dial and movement signed pat 73392/93 - hinged case back and dust cover on the inside - movement no. 56470 - case no. 48 - this model is shown in the HEUER catalogue from 1936 (photos 15 and 16) - servicing/maintenance history unknown - starts, stops and resets properly - no further accuracy tests were conducted Will be shipped well-packaged and by registered post with Track & Trace.