Yes it's authentic, no it's not particularly rare (most vintage Speedy collectors start with a 145.012 or a "pre-moon" 145.022). The watch is not in bad shape, but it could use a good cleaning. I'd be more concerned with the service history and if it's going to require one soon. All your other questions can be answered by a bit of research on your part. I would say the value is between $2800-$3200 depending on how "in-shape" the case is, little polishing, etc.
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