Lovely vintage TAG Heuer Professional from the 1985-1990 era. This 42mm wide 844/5 is very similar to the more common 980, but is powered by an early 17 jewel ETA automatic movement instead of an ESA quartz movement. The well-known, classic dive watch case, as the early models were manufactured by M.R.P. in Switzerland, is commonly referred to as a "Monnin" case. 

This 844/5 is very good condition and comes on the steel bracelet as a full set! Serviced recently, runs very accurate. Very collectable Tag Heuer! 3 months warranty.