Serial number 13602 was stamped on April 8, 1919. It was shipped to Southern California Music Co. in Los Angeles CA on July 30, 1919, which explains the Southern California Music Co. metal plaque on the back of the headstock.
Style 45 features:
Back and sides: Brazilian rosewood
Top: Red spruce (Adirondack)
Purfling: Abalone and lines on top, back and sides
Sound hole decoration: Abalone and lines
Binding: Ivory
Style 45 snowflake Japan pearl inlays
Style 45 abalone "flowerpot" headstock inlay
Style 45 backstripe purfling
Other period features:
Light scalloped X-bracing
Ebony fingerboard
Ebony pyramid bridge
C. F. Martin & Co. stamp on the back of the headstock
No style stamp
No pick guard
At the time of writing (April 8, 2019) this guitar is available at Schoenberg Guitars (http://www.om28.com/ProductDetail?product=P181116001)
Photos courtesy of Schoenberg Guitars