Omega De Ville - real or fake? If real, model/year?

My first foray into un-papered Omega. Got this from a fairly reputable high-end jewellery store in Vienna (Austria). The seller said they had spent a lot of time cleaning and renovating it (this was also their first Omega renovation). I know they replaced the strap and the one shown is a vintage strap from a different model (which I actually like). I pretty much bought this because I liked the look and I had consumed a couple of gluhweins (plus it's very different from my other Omegas).

Best guess is that it may be the 1968 Chrono De Ville 145.017, but I'm not entirely sure. The movement inside looks kosher. It's the lack of the "swiss made" on the dial that worries me the most. Could they have buffed it off? Are there instances of that being missing?