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The information on track 1 on financial cards is contained in several formats: A, which is reserved for proprietary use of the card issuer, B, which is described below, C-M, which are reserved for use by ANSI Subcommittee X3B10 and N-Z, which are available for use by individual card issuers: Track 1 Format B: Start sentinel — one character (generally ‘ % ’ ) Format code= ” B ” — one character (alpha only) Primary account number (PAN) — up to 19 characters.