| Thumbnail |
 |
| Catalog Number |
1500 |
| Description |
Marconi's Spark Coil and Gap |
| Denomination |
6c |
| Color |
multi. |
| Variety |
A914 - tagged |
| Printer |
Bureau of Printing and Engraving |
| Years |
1973 |
| Sorter |
1656 |
| Ebaylink |
http://www.ebay.com/csc/United-States/261/i.html?_armrs=1&_from=R40&_pcats=260&LH_Complete=1&LH_Sold=1&_nkw=%231500+Marconis&_sop=16 |
| HiRes |
 |
| Type |
Reg |
| Detlink |
https://stampsmarter.org/PNT/watermark/nowatermark.jpg |
| PicDetlink1 |
https://stampsmarter.org/PopupStampId/PB.aspx?ScottNumber=1500 |
| Date Issued |
7/10/1973 |
| Perforation |
11 |
| Watermark |
Unwatermarked |
| Num Produced |
53M |
| Paper |
|
| Printtype |
Litho. |
| Gum Type |
Water Activated |
| Series |
|