I would think it near impossible to get an appraisal on these panels as they are so different from Hunebelle's regular production. I've had a look through my copy of Andre Hunebelle Maitre Verrier Periode 1927-1931 by Louis Bénazet, (ISBN: 9782911955204) and can find nothing like them. I've tried emailing M. Bénazet but am not sure if the address I have is still current. I will let you know if I get a response.