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I know that you are beyond looking for a stenciled number but I found in the floor of the bow locker centered and toward the drain hole. As far as my opinion (and everybody has them) it looks like a 13 ft sport. I have been fairly intimate with mine for the past 7 months during the restoration. The under side of the front was my only question but after studying the lines, it's been chopped to the point it's hard to recognize but they are there and look correct to me. The inside inside front, on either side of the Norman pin are 2 distinctive humps that look like have been chopped (which they have). The bow locker appears to be correctly locate and just forward of that you can faintly make out the fill plug (where foam was injected).
Look at it this way at some point the boat was involved in a horrific accident and it survived but received an interesting repair job.
I say enjoy.