This is a wax seal stamp. It was made for a Valentine's event hosted by the hall where I lived as an undergrad. That year, we wanted to increase the 'classiness' of the year's event to trump the exceptionally classy event of the previous year. One solution was to send out all invitations with wax seals! The seal pattern was roughly sketched on paper before being created in Mastercam and milled onto an aluminum stamp.