Others have posted great information and I agree with Clark that Sonic Imagery Lab's US Specialty Precision Multi-Gauge is a great tool to determine exactly what perforations that your U.S. classic stamps have. However, you're still working on basic identification. So perf counting, your transparent perf gauge image that I helped you with, and many other methods are good enough for now.
Regardless, Sonic Imagery Lab's US Specialty Precision Multi-Gauge is pretty cheap and is useful for many things beyond exact perforation determination:
http://www.slingshotvenus.com/stamp...tyPerf5.html Seems that Richard Doporto's stock has sold out. His webpage points to here where they are still available:
http://www.amosadvantage.com/produc...egory=PRFGGEAnyways, your perf 11 2CENTS2 looks like it is a #500. The top line of the toga rope is at least nearly complete and the toga button is close to doughnut-like. The color of your stamp that I see on my monitor is not correct for a #500, but color seen on computing devices is not always accurate. Additionally, your stamp's image has no metadata that indicates what colorspace it is in.
To help identify it, scan it at 1200 dpi or above and post this area of it:
Posted 04/25/2016 11:11 am
