Your guitar was made by Valco. They made guitars under the Supro, National and Oahu brands. Yours has been refinished. This is the guitar with it's original finish.
I found this 1 pickup example with National on the headstock.The site says that it was built around late 50s, early 60s, so I guess yours is from around the same time period.
Here's a good site dedicated to Valco products.