Hey davech.
I agree with everything Hans had to say about your guitar and I may be able to add just a bit more information you might find interesting.
First, your guitar was part of the Lexington Series introduced in 1965. If you go here you'll see an early version of your instrument featured on the cover of the 65 Supro catalog.
The 2 prefix on your serial number label indicates the guitar was built in early to mid 1968.
The feature I find most interesting about your instrument is the toggle pick up switches. According to the guitars pictured in Supro catalogs, the Lexington always had push button switches like these:
This difference suggests to me that your guitar was made at the very end of the production run in 1968 when Valco was about to go out of business and they didn't bother to restock the push button switch units to install in the guitars. I guess it is also possible that using the toggle switches was a cost cutting measure as the company attempted to survive.
It has been reported that some Supros were made from parts aqcuired from Valco when the company assets were auctioned. It is possible your guitar is one of these. The fact that it has a serial number sticker suggests to me it was made at the Valco factory. However, the lack of a headstock label could be interpreted as the guitar being made after Supro went bankrupt.
Is there any evidence that the guitar had a headstock label in the past?