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The Gretsch-GEAR database exists to get it right: to document the actual serial numbers, to determine once and for all what was built and when, and to harness the collective knowledge of thousands of Gretsch fans to put the pieces together.If you'd like to learn more about Gretsch serial numbers, we highly recommend Ed Ball's "Gretsch 6120: The History of a Legendary Guitar." Ball is one of the key researchers who have determined the actual dates, years and features Gretsch serial numbers correspond to.

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Each of them can be used to accurately pinpoint the age of a guitar, if you have the correct information.

Unfortunately, correct information can be very difficult to come by.

The event was recorded in contemporary Chinese astronomy, and references to it are also found in a later (13th-century) Japanese document, and in a document from the Arab world.

Furthermore, there are a number of proposed, but doubtful, references from European sources recorded in the 15th century, and perhaps a pictograph associated with the Ancestral Puebloan culture found near the Peñasco Blanco site in New Mexico.

In contrast, α-tin (nonmetallic form, or gray tin), which is stable below 13.2 °C (55.8 °F), is brittle.