We currently have a 272a listed on eBay
, lower part of R. The I and P/U are different from USPS and USIR, I don't see why this can't be certed as a 272a, however, it's appeal to collectors is going to be low because it doesn't have the full watermark. The one in my collection has a full R on it.
It's very easy to tell the difference between an I and a "U" as well as the I and the P. The you body width of the watermark is 5mm wide, while the body width of the I is 4mm. To tell an I from a P, as long as you have more than 7mm of the leg (and it's 4mm wide), then you can determine if it's an I or a P. At the 7mm mark the lower edge of the D part of the P is visible. So this is distinguishable. But as I mentioned before, this won't be highly desirable. But any 8, 9, 10mm portion should be more than enough to verify the watermark as an I, P or U.
EDIT NOTE: Can this site PLEASE stop auto-correcting a capital "U" (without quotes around it) to "you"? So annoying. This thread is riddled with them, and I corrected this 3 times before I realized what was happening.