For US instruments, the serial number will start with a letter. Serial dating is easiest for instruments made in the USA or Mexico, but is also possible for those made in Japan, Korea, China, and Indonesia. First, narrow it down by the country of origin. A fantastic playing and sounding vintage Nylon String with tons of vibe for a nice price. Vintage 1960's Favilla C-5 Overture Classical. Imported models have a script logo applied to the headstock.This model was successful during the Folk Boom. The company continued for 3 more years importing instruments but folded in 1973.American made models have the Favilla Family Crest impressed into the headstock. Made in Long Island, NY.Favillas were made in New York between 1890 to 1970. Favilla C-5 Overture, 1960s, Serial number 107563.