An Example Of Great 19th-Century Quality Control

Offset perforations on 1st issue revenues are fairly common, the downside being that you usually end up losing part of the design somewhere on the stamp, i.e., the sheet was misfed rather than the perforators being set incorrectly.

Here's an example of misplaced perforations where only one perforator line was affected, thus creating an oversized stamp. Presumably there's a row of stamps (or quite a few rows, depending on how many sheets were perfed before the error was caught) of correspondingly short stamps.

Works out great for you. That's a great looking stamp. I don't want to buy the one underneath yours though! - jeff