Sequential (1898+)
1898+Purely-numeric sequential serial impressed on the neck block. The decoder binary-searches Martin's year-end chart to pin the build year. Starting serial for 1898 is 8,348.
Gotchas & format-specific sources
- Serial numbers 900001–902908 were used on Sigma-Martin (licensed 1981-1982 imports) and are not Martin-branded; the decoder rejects them.
- Martin mandolins pre-1991 used a separate sequence; we don't distinguish mandolins from guitars here.
- Martin's rare electric E18 and some signature models don't use the sequential chart.
- Backpacker and Little Martin (LX) have their own sequences; this decoder covers the main guitar/ukulele chart only.