Wavetone brand, unknown manufacturer, sold in greater Detroit area
associated with: Serlin & Co. and Sully's Radio Headquarters.
Last seen: 24-Sep-1926
The tube sold in April of 1924 would have both a brass base, and a tipped envelope. It wasnt until Aug 1924 that tipless tubes were announced. With tubes sold into 1926, variants include bakelite bases as well.
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- Radio Retailing, Jun-1929, pg. 267. From AmericanRadioHistory.com. Retrieved 30-Nov-2018. !