Label "43" on the back.
Most likely it was an unpopulated board.
Unreadable stamp on the back. Probably QC.
It was on exhibition at Vintage Computer Festival West 2019 at the Computer History Museum in Mountain View. Achim Baqué verified it and made pictures. Owner is known to Apple-1 Registry curator Achim Baqué.
Working after some work at VCF West exhibition 2019.
All ICs including PROMs are added later. Video connector J2 probably changed
Oct 24, 2019
Aug 10, 2019: Newly added to the Apple-1 Registry
Aug 10, 2019: 7 picture(s) added
Oct 24, 2019: Components added. State added
Oct 24, 2019: Handwritten number, label or stamp info added. State (shortlist) added. Components (shortlist) added. Description added
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