My name is Renato and I'm from São Paulo, Brazil. I have a Heur REF. 403 220 stopwatch from the 70/71. I want to sell it because I don’t use it and I think a collector would make a better use. However, I sought information on the internet about this model and didn’t find much. Here's what I got: 1/100th of a second, 1 lap in 3 seconds, 0-3 minute counter. Start, stop and reset to zero by the crown. 7 stones, shockproof. Present in Heuer's 1970-71 Catalogue. The stopwatch was evaluated by the company Antiquorum München by email, in October 2013, with a value from €500 to €700. I can send more photos if anyone needs. I don't have the original box or accessories. Thanks.