Westfield/Columbia didn't have any balloon tire bikes until 1934. The older bikes used 28x1 1/2" wheels, and balloon tires won't fit on them. The boy's bike looks original to me, except for the fenders. I believe the chain guard on the ladie's is correct, but the chainring has been swapped out for a smaller juvenile size. My info on serial #'s starts in 1936 with A-5000. They skipped a few letters, and started over again with A-5000 in 1955, so there can be some confusion on actual build dates.-Adam