Jolus 18K gold tachymeter chronograph watch - circa 1950 - manual winding - serial number 190 - Antimagnetic - 17 jewels - Glass, case, and dial in impeccable condition - non-original crown - Bezel diameter 38 mm - Total diameter 40 mm - total weight: 49 g - case thickness 13 mm - double case back - No case or papers. Purchased on Catawiki in September 2015. Maintenance history according to watchmaker: 10/19/1950 - 03/22/1956 - 07/08/1989 (5 entries) and after purchase in 2015. Z.R.C. leather strap 750 gold case weight: +/-10 g. A very fine collector’s piece. Works perfectly.