this number is on inside on floor.
They used invisible ink.
BF63640 this number.
Where on the floor?
What year and what body style?
As Craig and others have pointed out -- a few more details would make it more likely for us to be able to help. Photos are also great as they often show details that a new owner may miss. And if you place a quarter, ruler, etc. in the photo it helps us better understand the size of the numbers. Also if you take a few photos from different angles sometimes it helps us to see additional details. And a few from further away so we can see where the number is located in relationship to door jams, metal chanels, etc. And yes, please confirm which body/car you are discussing. In your profile it says 1924 Fordor but please confirm that you are asking about that car or a different one. And are you sure about the year of the body? Many of the Ts had engines swapped back in the day as well as lately.
For example an owner once asked me about a number on their car. I had no clue based on what they said. But when they sent a photo it was clear that it was a Murray Body Tag from a 1929 or so Model A Ford that someone had attached to the Model T sometime in the past.
Or in another case the tag was clearly a "1980's" or newer tag. Apparently it was attached to help register a reconstructed car etc.
And your photo(s) may prompt one more number style for us to research. We are slowly making progress on some of them and are at a standstill on others as we look for additional data and try to correlate what the data means.
Hap l9l5 cut off
its on the passenger side of car in the body of the wood burn in it,1924 fordor.
I did some checking for the letters BF but so far I do not see a connection to the other limited information I have.
Again, when you have some time, please take some photos and post and/or send them our way. We are looking to discover more about what they might mean. If you click on my name at the beginning of this posting it brings up my user profile and my e-mail address is the third line down.
Hap l9l5 cut off
As Hap has stated, pictures are a great asset in identifying thing on the Model T And other things also. I just was able to date a Snow Bird
Kit that was for a model T but it was the 1929
improved style,but was still being produced long after the T was not,they were improved and available to 1941. If you can provide pictures
I feel that there will be a wealth of information
coming your way.
By $00.02 cents worth of help.
BF Everitt was a body supplier very early on but I don't think they went past 1909 or so. Perhaps it's a Briggs body designation.
Branch assembly plant? Dave