Colt vs thirty-eight

Colt

noun

  • A revolver (gun) (from Colt's Manufacturing Company), associated especially but not exclusively with the American Wild West. 

name

  • A male given name transferred from the surname. 

  • A surname originating as an occupation. 

thirty-eight

num

  • The cardinal number immediately following thirty-seven and preceding thirty-nine. 

How often have the words Colt and thirty-eight occurred in a corpus of books? (source: Google Ngram Viewer )