http://www.currierandives.org/faq.html#5

This site shows you what to look for in the print itself. !! You will need strong magnification !!
While it looks like it could be one of the earlier prints, without being able to see it and handle it myself there is no way I can tell from a pic !! You might consider taking it to a good art gallery and let them take a look !!
May I ask where you got this print ??