If you turn the chip upsidedown could that be a monogram of BA or AB?
I wonder if books like these would be of help?
http://www.amazon.com/exec/obidos/tg/detail/-/0486223302/ref=pd_bxgy_img_2/103-8633343-6683812?v=glance&s=books
http://www.amazon.com/exec/obidos/tg/detail/-/0486283011/ref=pd_bxgy_img_2/103-8633343-6683812?v=glance&s=books
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