14 AA batteries 8 in one pack 6 in the other.
The GoldMaster was the first detector the family bought-then it was full on own your own years later-no sharing my machine.
It was a costly hobby back then even.
First GoldMaster machine cost my father his 30-06 hunting rifle and a $150.00 back in the late 60's that was a heavy sum.
Similar to the 3rd picture but only had metal/mineral detected about 1-2" in the dry sand. No discrimination, dug lots of iron.
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When the CoinMaster series was released it was a whole new world of detecting, the good times when every park, church, hall, was a virgin site.
My wrist ache now just looking at those handles.