Fairchild
From a photo of a real pre-NTI Apple-1.
7432 PC F, black plastic.
7551 date code.
Total # on board: 1.
Signetics
From a photo of a real NTI Apple-1.
Vertical labeling, black plastic, stretched “S” logo, additional S below part number. 7618 date code.
Total # on board: 1.
Fairchild
7432 PC F, black plastic. 7551 date code. Exact date code and labeling match to the real Apple-1.
Fairchild
9N32/7432 PC F, gray plastic. 7314 date code.
Signetics
Vertical labeling, gray plastic, block “S” logo, added S. 7408 date code.
Signetics
Vertical labeling, black plastic, stretched “S” logo, no added S. 7542 date code. Extra lettering can be removed as shown.
Texas Instruments
SN7432N, black plastic. 7528 date code.