Odd that Walter Clark ordered the gun in February, then had it shipped to Cleveland Cartridge Co. Cleveland was a major promoter of trap shooting.
The 1904 GAH was in June in Indianapolis and Cleveland supplied the traps. I didn't find Clark in the list of competitors
https://digital.la84.org/digital/col.../37904/rec/115
nor was he listed in 1905
https://digital.la84.org/digital/col.../37132/rec/124
Found this re his father:
Hugh G. Clark was in business in Omaha from 1876 till his death in December, 1892. Beginning in 1876, he was in the general merchandise business until 1884, when he sold out, retaining the agency for various powder and dynamite companies only, which of late years has developed into a large business itself. In connection with a branch, conducted by his son, in Denver, Mr. Clark's business extended as far west as Nevada, and north to Montana.