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Welcome to fordbarn. You posted in a section intended to be a place to test the site, usually for testing posting pictures. Leave it here (why spend the money to delete it?) but also post it here:
https://www.fordbarn.com/forum/forumdisplay.php?f=4
The BB prefix goes to a heavy commercial vehicle, I assume your frame is heavier than a passenger vehicle. The basic serial numbers started with 5000001, I assume to avoid duplicating the Model A numbers. I have never seen the 3 or Y you are asking about. The best source for information on the basic 7 digit number is "The 1932 Ford Book" (see
https://shop.efv8.org/collections/fo...tbound-all-new) which says your frame had an engine installed that was built early 1932. You can also find the information here:
http://www.fordgarage.com/pages/ABen...rs.htm#C1which places the engine/transmission build at May 1932.
When you post also update your profile to include your general location, that may be part of the answer.
Charlie Stephens