Scott Listings - 1/4 And 3/4 Perfs

Just curious if anyone knows if Scott rounds perf measurements to the Half?

I have been going through a pile of Albania stamps, that scott lists as being found in perf 12.5 or perf 11.5

However, I have found perf 12.25, 12.5, 12.77, 11.25 and 11.75 (In various combinations)

Are these actual perf varieties and scott chooses to round? - I can't be the only person that has seen these.

I have a Zumestein catalog that lists the same as Scott. I am waiting on a Michel cat to arrive.


(Stamps in question are year 1923, scott number 147 - 153, plus the various later overprinted ones)


I have also found unlisted perf varieties on a number of other series

Eric

Yes, in general, until the ~1990s Scott rounded all perforations to the nearest 1/2. Then a greater variety of decimal perforations (not just 10.9) began popping up in the US stamps. So Scott now gives the decimal perforations, and sometimes the nearest 1/4 when appropriate.

However, as far as I know, Scott has not bothered to update most of the earlier listings. This has caused me all sorts of grief over the past few decades as many non-US stamps have 1/4 or 3/4 fractional perforations. It's often a wild guess to see whether Scott rounded up or down on stamps with close perforation varieties. I end up having to look it up in non-Scott catalogs or wait until I get both perforation varieties.

I don't know the exact perforation varieties (other than the Scott mentioned 11.5 and 12.5), but I can tell you several of the later sets exist in a perf 11.2 variety that is not mentioned by Scott. In a few cases, the perf varieties are actually indicators of forgeries.

Thanks khj. I ended up creating a grid to try to track what I have found.

Just for future reference, in those albania sets I have:

12.5, 12.5x12.75, 12.75x12.5, 12.75x12.75, 12.25x12.25

And for the 11.5's (face values 2q - 25q only according to Zumstein)

11.5x11.5, 11.5x11.75, 11.75x11.5


I also have a number of copies of the un-issued Prince William stamps, all in various perfs (scott only list 13x12.5)

Correction on the Prince William Series (1920 - with and without overprints) - Overprints are Scott 120-128, un-overprinted are noted as unissued in both Scott and Zumstein..

Scott says: Perf 12.5
Zumstein Says: Perf 13x12.5