The number in the left-side column is the year, and the number following the year is the last serial number used in that given year. Serial number 8349 for example, would be the first guitar built in 1899.

What size is Martin OM?

For many the definitive shape, the OM shares its body size with the 000 but has a different scale length: the OM is 25.4 inches (645mm), the 000 is 24.9 inches (632mm). Favoured by fingerstylists for their 1.75-inch (44.5mm) nut width and even sonic temperament.