It's very possible that these were printed in the 1990s or later. Of a couple dozen prints sold on the internet in recent years, ranging from #4 to #90, all prints have been in absolutely identical condition showing no signs of damage including insufficient toning for their claimed age. This print frequently appears in batches in Japanese auctions for 100,000 yen (most recently in June 2019, an example printed on new white paper). Okada woodblock prints certainly dating from the late 1970s are seldom free of damage typically showing heavy toning and foxing damage.
≥3 APs (unusual since publishers of the era generally marked all proofs with H.C., and not A.P. or E.A.)