I purchased few years back an old Frederique Constant Chronograph from EBay and the seller (from Manila) did not know anything about the history of the piece (he thought the watch was dead too). There is no model number on the back; just a serial number 0018532. The piece has a Ronda 726 movement, which I know has been discontinued since the late 80's, perhaps the early 90's. I have seen only one other on the web, which was for sale somewhere in Germany a couple of year ago. Needless to say I would like to be able to date the watch

Can anyone help identify the model of the watch?

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The pushers are not the original ones; I had to replace them because the old ones were worn out. The watch came with this crown but I am not sure if it is original either.