Well it's NOT an American Express..
the Manco Amex is Model number 225-XX
None has scrub brakes.. the oldest version had a band brake, newer ones discs.
So that's obviously not it.
It looks Manco'ish I agree.. but the picture is still suboptimal...
Maybe those are Manco wheels, maybe they're not *shrugs*
'sid
[EDIT]
Ha! I know.. must be a Sears!
Sears sold replica Rupps,
and also Mancos
and the Mancos had a scrub brake instead of the original band brakes.
I only know of two seaters... but at least that's a plausible guess, right?