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The spine does have a curve but the edge dose not have a frown it may be a shadow making it look like it. It does have a smile.
The heel and toe seam to be the same but I would have to measure them...

When I decided to try honing I picked up 3 GDs for $15.00 2 are P81s with the red scales and the other has the same blade but with wood scales I don't know what model it is. here is a picture....

well the razor is a cheapo gold dollar that I pickup just to start learning to hone.so that could be part of the problem but I simply don't know yet.
my stones are

Norton 1000k
Norton...

I had my first shave with my own edge. All I can say is back to the drawing board:p My neck looks like a crime scene.