My point for showing pics is to see the similarities as well as differences. Here are 3 Basses side by side. One is English (Corsby), one ??, and one French (Barbe). You can see that between the 'known' English and French Basses shown there are some similarities. The Mystery Bass is a bit in the middle and then some!
Now, have a look at the Mystery Bass between the Barbe (19th century) and the LeJeune (18th century) Basses;
(Sorry for the size differences. It's the best I can do pulling them from other websites with my limited web skills)..
So, how do they compare now?