According to Blue Book of Electric Guitars Barclay guitars were built in Japan in 1960s, considered a House Brand but importer to US unknown. However, at the Guitar Site there is a suggestion that there are also US made Barclays. At the Harmony Database it is suggested that Barclay was distributed by Unity Buying Service.
Images of Barclay Electric Guitar courtesy of Sue Blow, Canada.
Barclay guitars label from 1960s classical guitar ebay
Barclay instrument ads from 1963 – Drums, guitars, amp and more.