He was unsuccessful in obtaining an endorsement deal with Martin, who limited their support to a 20% discount for all performers.

Harmony Musical Instruments Company of Chicago produced the Johnny Marvin Professional Tenor Ukulele as well as "The Prince of Wales" made of traditional koa wood.

[5] Marvin introduced Frankie to Gene Autry, another musician, and the two roomed together in New York City.

Autry returned the favor when his career took off, bringing Frankie and Johnny into motion pictures and radio to help with the music.

Although he contracted dengue fever, his Christian Science beliefs prevented him from receiving treatment, and he returned home where he died on December 20, 1944.