Antik Dragon Japanese & Other Fine Art has dated this piece to the 1920s.
Mint condition. Confirmed as genuine by expert Mike Moir (www.manddmoirco.uk).
D'Argental workmanship is consistently good and this vase is no exception, but D'Argental is not as well known as Gallé or Daum, so the prices are still quite reasonable.
Antik Dragon Japanese & Other Fine Art has dated this piece to the 1920s.
You can view the stock and full dealer information on the Antik Dragon Japanese & Other Fine Art Profile Page