Progress in Electronics Plate Block
Updated August 6, 2026
| Lot number | 938 |
| Estimate | 30.00 - 50.00 USD |
| Auction | Stamps & First Day Covers |
| Date | August 8, 2026 at 9:00 AM PDT |
| Auction house | Heroes and Legends |
| Location | Palm Desert, California |
Progress in Electronics Plate Block of 4 x 6c Stamps: Marconi Spark Coil, Marconi Spark Gap, Catalog #: Scott 1500, 1973
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