Thanks, Gordo, Lots of good thoughts. I appreciate your response.
That is a good thought to look at geometry. I multiplied 17'6"x83" (17.5' x6.9') to get 121 Sq Ft if the sail was rectangle...or 1/2 that (60 sqft) if geometry was a simple triangle. I wasn't sure how much area to add for the roach.
To answer your question (and add a few strange details, hence the question): No, it doesn't have a Hobie tag sewn in by the tack, so not stock hobie wave sail. The sail has the hobie "H" logo at the top of the sail. Sail had 4-5 full width battens. Sail is open foot. (i.e no boom)
Thanks again for the help.
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