1921 manufacture date (traditional estimates)
1921 shipment date, according to Spann's Guide to Gibson
Mandolin, Style A2
Factory Order number: 11392
Refret & replacement bridge by Lynn Dudenbostel.
The original receipt/invoice indicates it was purchased from the Flanner-Hafsoos Music House in Milwaukee, WI, September 30, 1922, for a price of $57.50.
Thanks to Andy M for the information