HEUER reference 1551 SGSZ extreme rare sidereal time German military-chronograph with comprehensive accessories, Switzerland around 1968, manual winding, frosted 4-times screwed down case with supply-number 6645-12- 148-2298, black dial with Arabic luminous numerals, original luminous hands, rhodium plated movement calibre Valjoux 230 with Flyback, 17 jewels, enclosed supplement configuration for astronomical determination in original leather folder supply number 6675 -12-308-6782, star map, sun glass supply- number 12-127-2258 in original box, astronomical year-book, copy of ZDv 7/8, original reduction-scale, in condition and completeness rarely offered watch, diameter approx. 43 mm, condition 2, property of a collector