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Lot of 5 large, heavily populated vintage IBM MST (Monolithic System Technology) circuit boards from the 1970s. These are the classic square aluminum-capped hybrid modules marked “IBM 22” that were used in IBM System/370 mainframes and related equipment.
All five boards are the larger, densely populated style with dozens of the silver aluminum-can chips, orange capacitors, and gold-plated edge connectors. Boards vary slightly in exact layout but are all similar in size and chip density to the examples shown in the photos.
• Untested – sold as-is for collectors, display, restoration, or parts
• Original IBM markings and date/lot codes visible
• Gold-plated edge connectors
• No major cracks or broken connectors observed
• Some boards have original IBM stickers (GA, GD, etc.)
These boards are becoming harder to find intact. Most were scrapped decades ago. Great for a vintage computer collection, museum display, or as a conversation piece.
Please review all photos carefully — what you see is what you get. Boards will be packed securely with plenty of padding.
Questions welcome. Thanks for looking!
Item specifics (suggested)
• Brand: IBM
• Type: Mainframe Circuit Board / MST Module Card
• Era: 1970s
• Country/Region of Manufacture: United States
• Vintage: Yes
