Hello,
Currently on ebay are two photos of Hanriot HD.1 machines at :
Hanriot HD.1
https://www.ebay.it/itm/765-10-WW-1-...AAAOSwYpxeSbhm
Hanriot HD.1 6608
https://www.ebay.it/itm/765-5-WW-1-A...gAAOSwb39eSbcz
Unfortunately the first one shows a serial but it is difficult to read.
Regards,
Clint