1973 Vacuum Tube Stamp Sheet of 50
Updated September 5, 2026
This auction ended on September 13, 2026.
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| Lot number | 90 |
| Estimate | 20.00 - 35.00 USD |
| Category | Stamps & Philately |
| Auction | LR Antiques Estate Liquidators Gentleman's Collector Auction |
| Date | September 13, 2026 at 8:27 PM CDT |
| Auction house | LR Antiques |
| Location | Houston, Texas |
Full mint sheet of 50 U.S. 6¢ commemorative stamps issued in 1973 as part of the Progress in Electronics series. Features the vacuum tube (Audion) invented by Lee de Forest, a landmark development in radio and early electronic communications. Complete with full selvage, ZIP Code mascot, plate number, and "Mail Early in the Day" margin inscription. Excellent condition. Ideal for science, technology, and U.S. stamp collectors.
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