Hi Torsten,
Sabino Art Glass is an American company who now own Sabino's moulds and still produce in France, mainly for export to the US. I've contacted them in the past and haven't found them very helpful either.
Your ashtrays aren't especially rare, but I believe they are no longer in production. The pattern is shown in Philippe Decelle's Sabino Maitre Verrier de L'Art Deco 1878-1961 as no. 9077 Les Fleurs. The price in 1931 was 35 Francs for coloured or 40 Francs for Opal.
Regarding finishing, I have to say that pre-war Sabino can be quite variable. When you say unpolished do you mean not mechanically polished or not fire-polished? I'd think it not unusual for functional items like ashtrays to receive little in the way of polishing. Also different batches can be finished quite differently so I wouldn't worry about the lack of polishing.
Steven