rounded finger joints

Just saw this box on Pinerest. Any idea how you do the rounded finger joints? not much out there on the internet. Apparently the Leigh jigs F! and F2 can do them but they do apparently make them any more
https://mir-s3-cdn-cf.behance.net/pr...e52dee6d47.JPG

Magic

Isoloc templates for Leigh jigs. Available at Lee Valley tools in Canada. Pricey though.
Templates and Attachments for Leigh Jigs - Lee Valley Tools

I wonder if a normal dovetail jig with an appropriately sized core box bit and bearing instead of a dovetail bit would do the trick.

Using a 1/2" spaced guide with a 1/2" core bit with a 1/4" shank would allow you to put a 1/4" ID x 1/2" OD bearing on the shank the same as a dovetail bit would have

Interesting, but I can't say that I like it.

Regards
Keith