Re: A variation on a theme ~ first day of booklet pane.

"Joshua McGee"
> Weird wording ("First day of booklet pane") but using entire booklet
> panes for FDCs is/was not unusual in the U.S.  I have examples going
back
> to the Prexies (1938).

Oh? OK then, first time I have seen them :)

Be careful, I would hazard a guess, that "first day of booklet pane"
<need not> necessarily, be always the same as a first day of issue of
stamp.
A curly one.