"Canuck" wrote in
Hmmmm....curious/strange. I went and had a look and you are right. My
foggy memory failed me. The A-11/YF-12A nosecones were different but
not like what is present in that image. It almost seems like an
intermediate morph between the A-11/YF-12A and the SR-71.
The other possibility is that someone bent it. 
Nick
Attachment decoded: YF-12A.jpg
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This photo is the YF-12A and the chine mod is for the ASG-18 fire
control radar. to insure directional stability for the chine being cut
three small fins were added to the rear of the underside of the YF-12A