HELVETIA early aviation-watch, Switzerland around 1935, manual winding, chrome-plated hinge case, screwed down turning bezel with luminous marking, black shiny dial with Arabic luminous numerals & indexes damaged/scratched, original luminous hands, constant second at 6, silvered bar- construction movement with fausses cotes decoration, early shock-absorber, 15 jewels, diameter approx. 37 mm, condition 3