Hello,
Currently on ebay is an unusually serialled Italian Nieuport at:
https://www.ebay.fr/itm/Aviazione-Mi...gAAOSw8-5eyX5S
It appears to show Ni 1 13388. According to G Alegi in WDF 92 Hanriot HD.1 13388 is a Hanriot serial. However Ni.388 was a Nieuport 10. Unusual.
Regards,
Clint