Rare Vintage 1970s Monsanto Silicon Solar Cell Wafer – Lot 90 (Parallel Line Grid Pattern)Includes High-Resolution Print Copy of Original 1970s Monsanto Factory Traveler Paperwork!
An incredible piece of early American semiconductor and photovoltaic history. This listing is for ONE (1) authentic vintage Monsanto 3.5-inch silicon solar cell wafer from production Lot H-10-90.
Item Features & Specs:• Manufacturer: Monsanto Industrial Chemicals Co. / Semiconductor Division• Diameter: ~3.5 Inches (3.425" - 3.622")• Wafer Design: Parallel horizontal finger grid lines with central vertical busbars.• Rear Stamping: Authentically back-stamped in black ink "90".• Dopant / Type: N-Type, Phosphorus Doped (PHOS).• Provenance Included: Every order includes a high-resolution paper print copy of the original Monsanto factory traveler tag detailing lot run numbers and inspection passes.
Condition:Wafers are clean, intact, and uncracked with excellent contact grid definition. Minor authentic factory handling marks on back faces. Please review high-res images for visual details.
Shipping & Packaging:Silicon wafers are thin and brittle. Each wafer is meticulously sandwiched between thick rigid cardboard sheets and shipped inside a cushioned rigid box via USPS Ground Advantage with full tracking.
*Take advantage of multi-item discounts when purchasing 2 or more!*