yes it is but this is not incuse its protruding and its slightly crooked and doesn't match up with the lettering on the reverse side.
I can't say for sure from the pic, but it does look similar to the 1951 listed on maddieclashes.com. It would be from the vertical bar of the N in CENT. Here is the link to the 1951. http://www.maddieclashes.com/TDC-1c-1951-01.html