10801 was Bertone...that was a very prolific name: I have more than 100 models listed under Bertone's name. Your next number is 10701, very close (100 numbers) to a name that made more than 100 models...I can't be more specific than that ![Wink ;)](https://www.autopuzzles.com/forum/Smileys/default/wink.gif)
Maybe I was going in the wrong direction. I always thought that the 100 models listed Under Bertone's name were beginning at #10801, so my next guess (Flaminio Bertoni) would be around #10901. Quite improbable, as Bertoni was working for Citroën. But who knows if #10701 was also Bertone ? It would explain your hint to Bertone being very prolific.
So, my final answer is : Bertone. If it's not, I must confess my total ignorance. Sorry, and thanks for your help.