Try looking on OTHER pieces of the glass - I've never seen a windshield without markings somehwere on it by the manufacturer. But, it may have been Water Bonett - and someone on this site recently pointed out that they may have been purchased by Taylor Made, which brings us back around to Fishtales's suggestion. Did you try contacting Taylor?
However, if you're OK with 'glueing' it in place (the previous owner apparently didn't use the proper stuff), then I would just do that again. Getting the glass cut locally should be easy since it's flat and you can quickly make a template for the shop. Use BoatLife LifeCaulk (in black, of course) and it will be a permanent repair. Lay a1/4" bead around/on the frame where the glass would set and let it tack it up. Then lightly press the glass onto the bead. Wedge the bottom of the glass so it doesn't slide down - tape the top. Let that dry for a good day or two. Then come back with more LifeCaulk and layer it into the channel till you get a nice, smooth appearance around the edge between the glass and the windhsield frame. If you do it right, it will look better than the other pieces! Take your time to avoid a messy cleanup.
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