sorry for that writing fault but, what a dealer or watchmaker says about a movement, is irrelevant for authentification in the online forum. A dealer will tell you often, everything is ok, but if you check the offerings, it isn't. The only evidence which counts for a proper authentification here, is a clear picture. Otherwise a propper authentification is simply not possible.
For authentification of a watch you have to check further details also, like the case back (inside), the movement and case numbers, manufacturer marks, company marks, gold marks, the hands, the crown, the dial - completely every detail. The script and the superimpose are not the same - not only a cleaning, even a reprint could have happen. Let's name it, I would buy another sample.
And you should ask first, bevore you buy, if you could not stand bad news.