Heuer diver from early 1980s. 42mm “full size” Monnin diver case with screw down crown. Stamped on back: 6035 W20 – 980.006. “20 ATM, ETANCHE, ACIER, QUARTZ”. Inside back cover is stamped: Brevet 503305 M.R.P. SA, Switzerland and Heuer-Leonidas 11096. This is a real vintage pre TAG Heuer that is very attractive, and in very good, pressure tested condition. vintage ready for everyday use, showers and all!