I love this watch. It's beautiful and it's not as large or heavy as most of the chronographs I've seen. My father gave this Heuer to me a long time ago and I've never been able to find much info about it. I thought it was from the fifties until I found this forum. I read the posts about the 73321 and 3641 and both look very similar to mine except my face is very silver and the sweep hand is very red. ( Dad is a true genius at watch restoration so I wouldn't put it past him to "improve" the sweep hand. ) Any clues as to what I might have? Thanks!