From a photo of Rev. 0 board 1070 (A2S1-0800), near locations F3 through F8.
C280xxM, 773x date codes.
Total # on board: 4.
Parts for my Rev 0 replica.
These are original ROMs from a collection attributed to Robert Sander-Cederlof, from his first Apple ][ system. These have date codes consistent with systems that have a serial number in the lower hundreds.