Model family · Seiko
Bullhead
2 references2 variants1970–1977
Family timeline
All recorded years
19701980
2 references in production order. Overlapping bars show overlapping recorded dates.
19701973197519781980
Dates are those recorded in the catalog. Faint bars mark approximate dates; a dashed point marks a single known endpoint. Undated references remain visible. Chronological order does not establish a predecessor or successor relationship.