If that crack is no worse inside than it appears to be it can be permanently repaired so as to be invisible by using a cyanoacrylate and then carefully sanding the finish into the area. I repaired a figured buttstock for a FAIR Verona that had just such a crack, several years ago, and the glued crack absolutely disappeared when sanding in the finish. I have done cracks like this one several times in the past with cyanoacrylate alone and never had one rebreak. I like these Satellite City glues for this:
https://www.ebay.com/p/1381286135?iid=254658154482 Just my experience, which is limited, but again, these glues have never failed me. I do like the idea of gluing in a fillet, of some type or another, for extra strength, but have never attempted it myself.
