That red Performer is a non-gas model.
I would not classify it as "mint." I would grade it
as very good condition and about 8 out of 10.
The $300 asking price is very high in it's
unrestored condition. $150 to $175 would
be much more realistic if you are looking for
a keeper. $200-$250 would be acceptable if
it was restored, and you were really looking for
red. For what it's worth- I would recommend red
over green, as the porcelain finish on the reds seems
much stronger and less prone to cracks and porcelain
pops.