This is supposed to be the same rose, sold under different names by father and son Guillot (who had separated their businesses). 'Catherine Guillot' was listed in the collection of Sangerhausen already in 1936; however 'Michel Bonnet' not. The latter must be a later acquisition. It is quite possible that a different rose was supplied under this name. Many such cases are known where roses are traded under false names. If only Sangerhausen had records of the provenance of their roses!