Sadamel made eccentric and oval turning chucks for the 102, that's not a Sadamel though. I saw one almost identical in a tool shop here a while back but don't remember the maker. It was at Ferner Coffres Fort in La Chaux de Fonds, easy to find on the web, worth emailing them the pic and asking if it's still there.
Otherwise send the pic to the usual suspects Luthy, Meuller, Scemama, Greub.
I have a Sadamel, it's less elaborate than that one but works fine. Most of these took ER/ESX chucks but there were some that took w20.