Which 1 Cent Green Washington Booklet Pane Is This?

Could anyone please help me identify which 1 cent green Washington booklet pane this is? I focus more on covers than stamps, but sometimes cover makers use unusual stamps and I am not an expert of any kind in the stamps. This is a first flight cover mailed on May 21, 1929 from Miami to Baranquilla, Colombia via the Canal Zone. It has a plate number pair of the 5 cent blue Civil Aeronautics Conference commemoratives of 1928, plus a booklet pane of 1 cent Washington green stamps. Thanks to anyone who can tell me for sure what Scott number this booklet pane might be.

Hi Kimo,
Logical choices are
405b 12x12
424 10x10
462a 10x10
498e 11x11

Since the booklet shown appears to be 11x11, Scott #498e. (you might want to double check the perfs yourself.)

http://www.stampsmarter.com/1847usa...ntifier.html
Don

Thanks 51 Studebaker! Now I will have to go and find my stamp gauge which is somewhere on my very cluttered desk. I will report back on what I find.

I found my perf gauge. The stamps are indeed 11 x 11 so it would be Scott 498e. Thanks so much for your help!