Perhaps the picture is giving an optical illusion. I see the frame as it surrounds the bar portion of the lock as being a flat surface. Every thing behind thar forward sculpted section looks to have a perfectly Square (L) corner to me. "IF" I am not seeing the picture correctly do enlighten me. Look at this picture closely & then look at the one in the H&H link, I believe anyone can see the difference. Call it what you will, but I don't call a square, sharp corner Round.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra