The G2775438 was built in 1913, according to the Singer database:
http://www.singerco.com/admin-support/machine-serial-numbers/single-letter . This serial number is for a Model 66 (built after March 19, 1913). The value depends on the condition and the specific cabinet and accessories that are with the machine. A worn model 66-1 with a basic cabinet is ~$50. The higher end cabinets can raise the price to $125. (Those were the prices ~10 years ago.) Someone wanted $175 for an advertised good condition model 66-1 with a really good cabinet on Etsy a few years ago.
I hope this helps.
Cindy Wells
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