An incredible piece of Cold War-era aerospace engineering: an unpopulated Honeywell Ceramic Multi-Chip Module (MCM-C) hybrid substrate board, originating from Honeywell's specialized Defense Systems / Solid State Electronics Center pipeline.Tracing back to a 1990 project lot layout, this co-fired ceramic carrier board features stunning, fully exposed screen-printed 24k gold tracing designed to accommodate up to 16 raw silicon dice for radiation-hardened space or missile guidance systems.Markings on Substrate: Crisply stamped "HONEYWELL INC." along the side structural rail.Factory Case Markings: Retains its highly critical original factory quality-control handwriting: 410-0700-600, Rev C, P90117-2, PL-Lit 16, MCM-A, REJECT. The "Reject" status means it was cleanly pulled from the production loop prior to die bonding, preserving the gorgeous, unpopulated gold grid matrix.Condition: Immaculate. No cracks to the ceramic, zero trace degradation. Includes original labeled plastic storage box. Perfect for macro photography, scientific education, or high-end display.TECHNICAL PRESERVATION & COMPLIANCE NOTICE:This item is a vintage, unpopulated semiconductor engineering sample, validation test vehicle, or historical computing artifact. It is sold strictly as a historical collectible, educational display piece, or for parts/restoration. Due to its vintage nature, pre-production status, and lack of standard retail packaging, it is offered completely AS-IS, with no guarantees of electrical functionality. No returns or refunds will be accepted based on structural performance.