According to a 1976 Seiko catalog posted at GMT+9, the price of the JDM Bullhead was 24,000 yen and the JDM Yachtsman was 20,000 yen. A yen currency conversion chart on Wikipedia indicated that $1=about 300 yen during that year (so about $80 for the Bullhead). However, it seems like US prices were a bit higher than that, and a 1971 magazine print ad currently on e$bay has the Yachtsman listed at $135 (the other watch in the ad is a 6105-8000 listed at $75).
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