mdlock-- unfortunately your grandfather and/or great-grandfather didn't have the technology we have today, where we can see an image of the stamp we think and hope we have at the click of a mouse. The advantage today, is that some philatelic information is so much more available--- that is, some (some knowledge is still in books that are out of print, and very expensive).
Siegel power search for 172 shows perfs that don't look like normal perfs, and your stamp looks like normal perfs. The re-issues were all on hard, white wove paper, and were usually cut with scissors:
http://www.siegelauctions.com/lot_grd.phpHere is one of the best on that site:

Hope this helps-- Ray