Fairchild
From a photo of a real pre-NTI Apple-1.
NE555V F, black plastic.
7538 date code.
Total # on board: 1.
Signetics
From a photo of a real NTI Apple-1.
Vertical labeling, black plastic, block “S” logo. 7609 date code.
Total # on board: 1.
Fairchild
NE555V F, black plastic. 7539 date code. Very close date code and exact labeling match to the real Apple-1.
Fairchild
Labeling amost worn off, but appears to be an NE555V F in black plastic.
Fairchild
UA555TC F, black plastic. 7623 date code.
Fairchild
UA555TCQM F, black plastic. 7828 date code.
Signetics
Vertical labeling, gray plastic, old “S” in box logo. 7234 date code.
Signetics
Vertical labeling, black plastic, block “S” logo. 7547 date code. Close date code and exact labeling match to the real Apple-1.
Texas Instruments
NE555P, black plastic. 823 date code.
National Semi
LM555CN, black plastic. 7643 date code.
KIA
555P, black plastic. 946 date code.