1974 ?
They were introduced in America in 1976 as I remember (In my job I used to deal 'across the pond' & was persuaded to order one for when they came over here). We waited 18 months & it it took 2.1/2 years to pay for, but the freedom it gave us was marvellous.
Pity VHS won the 'war' because Betamax was far superior, though it had a shorter recording time. 25/26 years later it was dead.