Beautiful example! It looks correct to me, I can't be 100% sure about the crown but yes this model would have had a large, unsigned crown. I'm not at home to compare to mine, but the size looks right.
I'd say that if the movement is in good shape (no rust, all parts are present and the chronograph starts, stops, and resets properly) then yes, 15-20k CAD (11-15k US at current exchange rates) is about what it's worth IMO.
Best option for appraisal is probably an auction house.
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