I used stampsmarter.com. Step by Step:
1. 1847usa link
2. Visual finder drop down "Washington Franklins"
3. It is a Washington head Denomination in Numerals, so select that type of image
4. select 6 cents
5. perf 10
http://www.stampsmarter.com/1847usa.../d36p10.htmlNeed to watermark check
single-line means it is 429, but no watermark at all will be a 468.
Hope this helps, ggreve.