So it's a year and a half later and I'm still trying to figure out how to tell a Cleveland-built Roadmaster from one built in Little Rock. The best original source I've found is a 4 page brochure posted on Dave's Vintage Bicycles (Thanks
@Dave Stromberger) that was originally in the June 1956 issue of American Bicyclist and Motor Cyclist magazine. It has pictures of the plant in Little Rock with the heading "Open for Business! Newest in the bike industry, $1,250,000 AMF Little Rock plant won't be dedicated for 60 days, but it's already turning out bikes, and in 4 months expects to be up to 3 thousand every 24 hours!"
www.nostalgic.net
A Christmas ad in the Dec. 1956 issue of Boys' Life still lists the maker as "the Cleveland Welding Division, American Machine and Foundry Company, Cleveland OH", but by June 1957 another ad lists the address as "the AMF Cycle Company, Little Rock Arkansas". None of this gives an exact date, and it looks like both operations were running at the same time for a while, which only makes sense - if you've got orders to fill, you don't want to shut down one plant before you make sure the other is up and running full speed.
So here are (2) 1957 Flying Falcons. One has a serial number starting with "A", and still has the "Masterweld - Cleveland Welding" decal and a 1956 style badge, while the other has a serial starting with "B", and has the "Masterweld - AMF Wheel Goods" decal and a slightly different head badge (both have a "G" to the right of the serial on the bottom bracket). But I'm guessing the decals have nothing to do with where they were made, because I can't see any difference between the frames. You would think that if you were going to set up a new factory, you would take the opportunity to make some adjustments while you were at it, but there's nothing I can see. I'm starting to wonder if the Little Rock plant didn't start with the cantilever frames that were introduced for 1958, but I don't know.
It would have been nice if the different decals indicated where they were made, but I guess that would have been too easy.