Nope, none "sneaked out"...that's not a '73
That VIN, "GanGuF159670" is fictitious! The last RWA Midget built in 1974 was GAN5-153920....the first rubber bumper Midget built in 1975 was GAN6UF-154101.....if he read the VIN incorrectly & it really is GAN6UF-159670 then the car was built between Aug 1975 & Aug 1976.
Its a 1975 Midget! & it should have a 1500 engine!
That's the reason they were called "Midget 1500"
I'm not doubting what any previous or current owner thinks - but what I'd guess has happened is real simple - somebody changed the engine to a 1275 & somehow got the car retirled as a '73 to dodge emissions rules that took effect in 1975...or, the 1975 title was lost & somebody took it to a non-title state (some states don't require titles for cars 1974 & older - Alabama is one of them & he's right on the border of AL & FL) & registered it as a '73 to get it back on the road.
That said, I'd bid up to $1,000 on it were it closer...there's lots of money to be made parting it out!
However, that's a bogus auction run up by a buddy of his (buffylusk) so I wouldn't enter that auction.