national semiconductor SN7473 integrated circuits featuring gold plated ceramic packagingmanufacture date code of 6819 meaning produced in 19th week of 1968.•rare, highly-sought collectibles.
•rare '74 series' housed in premium gold-plated ceramic side-brazed packages making them highly unusual. manufacturers typically saved expensive gold ceramic packaging exclusively for military-grade "54 series" chips.•Their remarkably early 1968 manufacturing date makes them highly prized "New Old Stock" display pieces for vintage computing enthusiasts• very rare pair