Yes
K killer67A close up of the dial would help with dial originality/authenticity
The Longines extract offers the least information of any of the manufacturers that have this service. Alternatively, and possibly depending on what you paid, you could get a certificate of authenticity for $175 where their watchmakers authenticate the watch.
Glad everything worked out; it looks like a very nice piece. Humphrey Bogart (my avatar, actually) often wore a tonneau case Longines in the 40s and 50s. 馃槑