[Cherryville Chuck]

All that is is a round over bit that is also cutting two fillets. The bottom fillet is achieved by switching to a smaller bearing. A cove bit of the same radius should match if they are well machined. That means I wouldn't trust anything Chinese.

 

[Cherryville Chuck]

Your drawing reminds me of a thumbnail bit but you'll be unlikely able to find it's mirror image. They may have been custom ground. https://www.google.ca/search?q=thum...-s7ZXVAhXky1QKHeLHBAgQsAQIRw&biw=1920&bih=971

 

[Cherryville Chuck]

Seems to me a few years ago I saw an ad in a mag for a tool that would grind knives for a molder. I can't remember where or how much but it might be something you want to try searching for in your spare time.