If you can get your sons to post a high-resolution, colour scan (ie: 600dpi or greater) of the area I am pointing to in my attached picture, it will help identify your BPN.
Even if it cannot be easily seen in the scan, I can do a bit of Photoshop magic to make it appear.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.