1870 issue with a grill impression 30¢ - #143
30¢ - Black or full black
20,000 - H Grill (see below) White wove paper, thin to medium thick
P12 - Scott #143 - 1870
Centering is usually poor
The H grill is 11-13 points wide by 14-16 points
No postmark with gum (MH): $5,000-$16,000
Full perfect gum, no postmark, no trace of stamp hinge mark (MNH): $14,500-$20,000
There is one instance of an 'I" grill , an unused example sold at auction for $65,000
A certificate from stamp expertisers such as the PSE, would be required if interested in selling this issue.
Grills are often forged. See below for an image of a genuine H grill.
A fake grill applied to #143 (sold on ebay)
The H grill's size relative to the stamp