Oscar Schmidt Stella 12-string (1920s) ↓ Below is the appraisal result by Gemini. To get straight to the point, the identity of this instrument is a 100-year-old **"Stella Guitar-Mandolin."** 1. Identification of Official Product Name and Era • Official Product Name: Stella 12-string Guitar-Mandolin • Manufacturer: Oscar Schmidt Company • Model Features: While having "6 courses of 12 strings" like a guitar, it is a hybrid model that fixes the strings with a tailpiece and adopts a movable bridge, similar to a mandolin. • Era: Early 1920s to mid-1920s (approximately 100 years ago) • Basis: The characteristic "square dot decal decoration (rosette)," found only on Oscar Schmidt instruments from the 1920s, and the metal trapeze tailpiece, which was standard on Stella instruments of that era, match perfectly.