Here is the info I've gathered:
Falcons started in the USA with a simple mark of Falcon 1 or 2 or 3, etc. They were exported to England 1955-1957 under the names of ALCO and Rollit (marked PP). There have been several manufacturers.
ALCO was manufactured in England starting in 1964 with a different bowl size.
F2 thru F8 were made by Fry Diecast
P4 is Presbar Die 4
The "Made in England" marking started in the early 60's. FD plus a number is Fry Diecast - the number range is FD1 - FD19. The Bantams were marked as FD B5 or FD B7 OXFORD can be marked on the Humidome, but not always.
The Shillelagh started production inb May 1966 with FD8 marking. They came in solid black with a black stem, or a bright with a white stem, or a bright with a light blue center with a white stem. You could buy a colored bowl or a traditional briar.
Federal Die Casting is marked FDF/FDG/FDH.
Andoic is marked AN plus a die number
AN2 - 1974
AN3 - 1982
Irish Falcons are confusing - mostly marked Falcon Ireland but could be marked Falcon Great Britian which had Irish stems and an English made frame.
From 1975 to 1981 there was a Falcon Head imprinted on the stem.
Hope this helps, if any of the info isn't correct, please let me know.