To Girard-Perregaux and Excelsior Park fans, here's a mystery that needs solving.....a quick back story. In early 2019, I was offered a number of watches by a friend of mine on behalf of an old watchmaker who was retiring, one of them being this lovely triple-register Excelsior Park chronograph, which I purchased. The old watchmaker told me that he had bought it in 1972 from the Excelsior Park distributor, as they couldn't sell it for some reason. He was asked not to wear it for a while and he just stuffed it in a safe and forgot about it. A few months later I was in a cafe and someone on the next table commented on the beautiful Girard-Perregaux Olimpico that I was wearing. I told him that he was mistaken, as it had Excelsior Park on the dial and presumably Witrand was the brand. (It turns out that Witrand was the name of the EP distributor in Johannesburg, which has since closed down many years ago.) After doing some further research, I discovered that EP made watches for Girard-Perregaux, Gallet, and a number of other leading brands back in the day. GP had a tradition of releasing 'Olimpico' watches for the Summer Olympic Games. They released 999 pieces of their Olimpico for the 1968 Olympic Games, and my one is practically identical to that model. No wonder the guy mistook it for the GP version.I can only imagine that my one is very rare, as I can't find another example anywhere on the Internet. It's in beautiful condition. I found a reference to it in an old Japanese EP catalogue page, as well as one on an ad showing a similar model under an Excelsior Park banner. I'm sure that GP must have been very unhappy to discover that EP were competing with them, by advertising a 'replica' model (if I can call it that.) I haven't come across something like that before where a contracted watch manufacturer to a big brand, can come out with their owm 'version' that looks exactly like the original. If you have any reference material or similar EP watches that could help solve the mystery, it would be appreciated.