Stellaguitars - There are no serial numbers on Oscar Schmidt Stella and Sovereign guitars that will identify the approximate date that a particular instrument was made. But instruments made by Harmony, including
Washburn Guitars
1900's Washburn Parlor Natural Acoustic Guitar, Serial Number | Lot #81034 | Heritage Auctions
Washburn Guitar Repair & Servicing
Washburn Guitar Serial Number Lookup | Peatix
Sold at Auction: Washburn W 114 Electric Guitar with case. The Serial number is 050800111.
Dating a vintage Washburn acoustic – FRETS.NET
The Serial (Number) Bowl Date Your Guitar or Bass – Still Kickin Music
Washburn Guitars
The Serial (Number) Bowl Date Your Guitar or Bass – Still Kickin Music
Sold at Auction: Washburn D13S Acoustic Guitar
Dating a vintage Washburn acoustic – FRETS.NET
1990 Washburn D10N Dreadnought Guitar
WASHBURN CHICAGO SERIES SBS-20PWH ELECTRIC ACOUSTIC GUITAR USA Made 1981 w/case | eBay
Dating a vintage Washburn acoustic – FRETS.NET
USED Washburn Washburn / MG-92RNM [20 – Ishibashi Music Corporation.
USED Washburn / EA20 Natural [03 – Ishibashi Music Corporation.
Vintage Washburn Mandolin Restoration: Serial Numbers » Florian Vorreiter Lutherie
Found this Washburn and has no serial number anywhere on it. Apparently that means it was a prototype? Can't find much about it. Any ideas on model? : r/guitars
How To Date Your Acoustic Guitar By The Serial Number – FuelRocks