Hi Joe,
My post regarding your green camelback Columbia on the Ratrod site essentially covers both what I know and speculate regarding Westfield serial numbers and decoding build dates from them.
Reading the attached photo as ?24624, I can?t tell what the first letter/number is from the photo of the bottom bracket or if there is another letter/number in front of the mystery digit.
Later Westfields have two strings of letters/numbers stamped in the bottom bracket so you may also find more digits with additional cleaning.
As I mentioned in the other post; 1934 and 1935 bikes definitely use the letters M an N to distinguish the model/year but if there is no letter in the serial number on your bike it may be that along with dropping the model letter stamped in the badge, Westfield also did not designate the model year in the bottom bracket stamping during the late twenties.
Without the help of the serial number I would place the bike between about 1928 and 1932. I have been trying to locate some Elgin information I have from the twenties but I believe that the red colored saddles and chrome plating were first used in 1928.
