There were star, cross and number stamps. All kinds of different opinions on what they actually mean/meant. Some folks think they mean that the bow was returned to the factory for a refinish or repair and others believe that they were marked down or clearance priced bows (ie: last years model).
I tend to think they were marked down bows.
A good number of '64 Kodiaks are cross stamped across or near the serial number and you will also see a fair number of '61 Kodiaks and '61 Kodiak Magnums that are star stamped.