Vactron Radio Tubes appear to be branded by 

Rhodes - Burford's Exchange Company, 4th & Broadway, Paducah, KY, USA

First seen: 18-Sep-1927
Last seen: 20-Oct-1927

Brand(s): Vactron

I find only one ad run in two newspapers, Richmond, Indiana; and Louisville, Kentucky. 

The Vactron UX201-A appears a standard tube with envelope label. This one tube from an old eBay auction shows the design.

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