Regarding the continental prince's crown and the H, other candidates may be Heinrich prince of Prussia, younger brother of Wilhelm II, grandson of Queen Victoria as well and an avid hunter in his younger years, or Hubertus prince of Saxe-C-G, nephew of QV, or one of the many Heinrich Prince Reuss, also with close connections to Britain, or one of the many other German Fürsten/princes. Without documentation from Henry's ledgers it is all speculation, as CptCurl wrote.