I have not bought it yet, don't even know a fair price on an unknown chronograph brand. I'm lost on this oneIt is certainly not junk, even if the brand was small/unknown. Many, if not most, chronographs were generic (some exceptions) - and many companies put their brand on dial of countless venus, valjoux, and landeron calibers.
Photo of the movement is really needed - I suspect something nicer than the usual landeron '48.
Ok tnx for good input , i understand your point ! I have a private watchmaker who fixes my watches so a service will be no problem.The "worst" movement for that would be a Landeron 48. This is not a bad movement, it is just dead common and therefore the least attractive for the ("serious") collector. Even then, the 300 US$ depend on the state of the watch. If it isn't working and needs parts replacement, 300 US$ is rather too much. Even if it perfect condition and recently serviced, 300 US$ for a Landeron 48 sounds OK - but a professional vendor would take more off you (he has to give a warranty and has more overheads to cover than a private seller). If the movement is a rarer calibre (e.g. Excelsior Park, or even a manufacture calibre, e.g. Longines, Minerva, etc. - but I doubt that it is), 300 US$ is OK for a working but completely unserviced watch. A perfect one, even from a private seller, should cost rather more. And so on, and so forth. The bottom line is that it depends a lot on the movement, the state of the watch (particularly movement) and who's selling.