US Unique Airmail Cover 1928//1949 - C10a, C25a, C37, C41, C39a Each Cancelled First Day

US Unique Airmail Cover 1928//1949 - C10a, C25a, C37, C41, C39a Each Cancelled First Day. Legal Sized FDC with:

C10a nicely centered pane cancelled  Washington DC May 28, 1928

C25a  booklet pane of 3 cancelled FD Mar 18, 1943

C37 strip of 3 cancelled FD Jan 15, 1948

C41 strip of 3 cancelled FD Aug 25, 1949

C39a booklet pane of 6 cancelled FD Nov 18, 1949 C37, C39a and C41 are unofficial Philadelphia FD cancels. Fabulous and unique C10a combo FDC bought from Al Zimmerman ~ 35 years ago for $450. 1/4" tear at top, 2 1/2" in from right.