The core Buffalo checklist is just one run: the 1 oz coin, year by year since 2006 — far simpler than tracking the Gold Eagle's four parallel size runs. The one wrinkle is 2008, where a fully complete collection technically means five coins for that single year (the standard 1 oz plus the one-time 1/2 oz, 1/4 oz, and 1/10 oz fractional issues) rather than one. Decide whether you're chasing that 2008 fractional set specifically before treating your checklist as complete on 1 oz coins alone.
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One per year from 2006 (first issue) to the present, plus the four separate 2008 sizes if you're chasing that one-time fractional set — the core 1 oz run alone is far shorter than the Gold Eagle's four parallel date runs.
Only if you define "complete" to include them — they were a one-time issue and most collectors treat the 1 oz year-by-year run as the core checklist, with the 2008 fractionals as an optional, pricier add-on set.