Stig,
Currently on delcampe is a Caudron R.4 at:
https://www.delcampe.net/en_GB/colle...419300572.html
I assume since this one shows the more commonly seen engine,that this is a Renault 12Db powered machine and the one in the previous photo one with the Hispano 8Aa. Or not? I don't have the Hauet work you referred to previously. I take it that this is th WDF.Does it contain any more photos of the Hispano powered machine?
Regards,
Clint