Well, this is a shame but the archivist at the Hagley Library says that she's looked for any reference to Gettysburg in the BB&B collection and the only thing that she found was this in a ledger book:
It says "Joint catch and stem" and "Sell bronze xx ea."
IOW, nothing about 1938.
She said that the records are much more complete for anything that had a precious stone in it.
There are many boxes and she looked in what she thought were the most logical places - but there are a lot more records to go through. So I still plan to get up there when I can.