Anything 70's or before was made in Grayling which should be in the silk screen.
Serial numbers starting with K were made in the 70's and serial numbers starting with 5-9 were made from 1965-1969 respectively (that may also be true for 4: 1964, can't remember off hand). Before that I don't think the serial numbers can be used exlusively for dating.
That's the Bear 101 (and about all I know). In fact I don't really know anything specific about the Black Panther model. If you go on Ebay, they were all made in 1953. That's the patent date and doesn't mean a thing except higher bids.