Won't that make a mess on the back?
It will color the points of the grill. The method is to lightly shade a spot on a piece of paper, rub a fingertip over the graphite marks, and gently rub over the grill.
Large banknotes stamps have either H or I grills
H = About 10 x 12mm (11 to 13 by 14 to 16 points)
I = About 8.5 x 10mm (10 to 11 by 10 to 13 points0
"On the 1870-71 stamps the grill impressions are usually faint or incomplete. This is especially true of the H grill, which often shows only a few points'
Below are the sold listing on eBay
for U. S. 136 if you can find one, not one on the first page!http://www.ebay.com/sch/i.html?_odk...6&_sacat=675