Bradley Gent has dated this piece to the 1920s.
There were two dahlia boxes made, trois dahlia and this one which has six flowers.
This box is the harder one to find, presumably there were less made and therefore fewer turn up.

Moulded mark R Lalique and engraved France.
The condition is very good there is no damage or faults.
Marcilhac page ref 231
Model no 47
introduced in 1922
Bradley Gent has dated this piece to the 1920s.
Specialising in rene lalique glass
You can view the stock and full dealer information on the Bradley Gent Profile Page