Anyone else prefer the 21 over the 25? Also, packaging question.

[Omega Leather Works]

It's the transition point from the flat part of the spine to the rounded part of the spine.

Thanks! So it's just for looks? I thought there was a chance that it might have to do with a jig to facilitate grinding or manufacturing or something. Kind of like the location hole in the handle of the 21. It just looks a tad odd, but I'll take your explanation.