AS a long time collector and buyer of accumulations and collections, this past summer I was lucky enough to be high bidder on a partial collection from Indiana. When I got the lot in the mail and began really looking at what I had bought, I found 3 Shelbyville 734's, a few pages later I saw what I thought was a fairly common South Whitley L-1 on a Scott 300 stamp, with a straight edge. The straight edge is what made me look a second time, that was when I noticed it was a coil perf 12 vertically. So I grabbed up my pages of an old Scott I tore out and use to ID stamps, etc and saw this potentially is a 318, and has no known USED Copies. I did my due diligence in checking if it was one that had perfs cut off, and it doesnt look like it to me. Anyway this will be on its way to APS for expertizing soon. Just thought I'd share.
There are two very similar South Whitley precancels currently listed on eBay both with APS certs stating they are trimmed #300 sheet stamps. What features of your stamp differentiate it to make it a genuine 318 to you?