Possible Perforation Anomaly , Need The Asian Experts Opinion.

Ok, so going through stamp albums of my fathers,two North Korean stamps

Scotts #'s 160 @ 161 values of 2ch and 10ch respectively.The release

honors the launch of the Soviet Luna 1 moon Rocket. Now to the heart

of the matter. A note at the bottom of the listing describes the stamps

having been released with gum ( perf 10) and without gum (perf 10.5).

The two loose stamps and the FDI cover examples clearly measure out at

perf 11. Any input on this is greatly appreciated.

The "normal" perf. is most likely 11


From "Stampworld.com"

Thanks for the response . Over the years I have found listing errors in the catalogs. Also on a separate note I have 2 other North Korean examples ( #,s 394 and 429), which are imperf with sheet margins. Yet there is no such note that is common after the listing stating such? Thanks again.

Also for the initial post the two singles have no evidence of gum, this is why I ask. As for the two first day covers , I cannot be sure?