Here's What Appears To Be A 2c Blue Playing Card Revenue Part Perf, R11B

Not eye-candy, but I think definitely a contender. The top/bottom margins are sufficient (sad, though, that it was cut at an angle at top). The left/right perforations are very jagged and look suspicious, however the imperforate R11a is much pricier ($1750 vs. $325 for part perf) so it wouldn't make sense to manufacture from the imperforate. Thoughts?

With these margins, the probability of it being a trimmed perforated stamp are very high.

revcollector, I was thinking that the vertical margins on the left (26mm) were considerably larger than what perforated examples would have. But, understand that stamps of this time (Banknotes too), sometimes yield larger spacing between perforations. So, is it generally a pair that is needed to confirm a part perf, or is there a length between edges that will confirm on a single?

Much has to do with how the edges actually look under magnification as well as size. Shade, impression, cancel date (if any), paper, all are important as well. Alas, pairs do not always prove anything because there have been many imperf pairs with added fake perfs created. It is always important to note the cat value of both imperf and part perf multiples when examining pairs. Part perfs are always the most difficult to expertize, and really must be seen in person unless something obvious such as a too late cancel date or really impossible shade or impression is seen.

i do not like the shapes of the right side perfs. otherwise I agree with revcollector.