J.B. Rose & Co. had a private die proprietary stamp prepared in April 1872. The essay submitted to Mr. Rose for approval pictured an older, bearded centaur. Mr. Rose requested that the die be modified, stating "leave off the beard, more hair on top of head." These changes were reflected in the issued stamp.
J.B. Rose & Co. Essay and Issued Stamp
Detail of Vignette from Essay (left) and Issued Stamp (right)