1960sarchivalarchiveauthenticateauthenticationblack and whitecollectioncollectorseditionembossedEstateexclusiveHoppyhoppyx.comJohn Hopkinsphotographicphotographyprintrectosignaturestamp Estate of John Hopkins recto stamp A round embossed recto stamp from the Estate of John Hopkins with the text Hoppy Estate Edition around the outside, encircling a facsimile of Hoppy's signature: used for authenticating photographic edition prints Gallery: Keywords 1960sarchivalarchiveauthenticateauthenticationblack and whitecollectioncollectorseditionembossedEstateexclusiveHoppyhoppyx.comJohn Hopkinsphotographicphotographyprintrectosignaturestamp
