The sewrial numbers I know I have seen on the gibson website. they can be tricky.

The LG0, of which I own a 1964 version can be found all over the ads in vintage guitar magazine from anywhere from $450 to $750 based on condition. the older ones with the rosewood bridge tend to go for more than the poorly made plastic bridge found in the mid 1960s. generally these guitars were all mahogany with the late sixties versions having a spruce top.

altogether Gibson made 4 versions:

Lg0 all mahogany with ladder bracing
Lg1 spruce top with ladder bracing
Lg2 spruce sunburst top with with X bracing
Lg3 spruce natural top with X bracing

These guitars are very popular still. In my 1962 gibson catalog, the LG0 was $80 and the LG3 was $120. As you can see, they have appreciated greatly because they are all solid wood made in USA and have exceptional playability.

They don't call me Mr. Gibson for nothing!