Heathkit GD-16 Series 4-Position Selective-Call kitMakeHeathkitModelGD-161AGD-161DYear~1962Orig PriceGD-161A - $33.95 (1962)GD-161D - $37.95 (1962)DescriptionSelective Call kitPower InputGD-161A - 117VACGD-161D - 12VDCHeathkit GD-16A