As a result, he endorsed the Harmony and Gibson guitars and Harmony ukuleles. Smeck was also known for his work on the Harmony company's Vita-Uke along with a number of other versions sold with his signature across the headstock.
Because of this, he supported both Harmony and Gibson guitars and Harmony ukuleles.  Smeck was also known for his work on the Harmony company's Vita-Uke, as well as a number of other models that were sold with his signature on the headstock.