A Slovenian hop seal from the era when it was part of Yugoslavia. Hmelj is Slovenian for hop.
From Philippe Lanez, "Possible hranilnica-kreditne službe, credi bank. I think the three B.H.K. Yugoslavian of the Gallery could be something hranilnica-kreditne.
This one reads one side, JUZNO (south) B.H.K. JUGOSLAVIJA. Other side incomplete reading could be ??RMELS STAJERSKI SAVDOL.