Side A: mx. 100404-1 (= Okeh mx. W404036B) was recorded May 23, 1930, New York, NY. Note: this recording is actually by Arthur Schutt And His Orchestra and features vocals by Irving Kaufman.
Side B: mx. 100402-1 (= Okeh mx. W404204A) was recorded June 6, 1930, New York, NY. Note: this recording is actually by Ben Selvin & His Orchestra and features vocals by Irving Kaufman.
In the notes on that DAHR link, the editors state "Johnson and Shirley note the performer as Selvin's Orchestra, using the pseudonym Ray Seeley and his Orchestra (and other listings); Rust Dance bands notes that Seeley "was a real person" and makes no reference to the Selvin organization for this master." However, in my copy of Rust's "Dance Bands" he lists the recording under Selvin's name (with Lambert on vocals), and states that it was released under the Seeley pseudonym only on Odeon ONY-36106. DAHR also mentions that the primary source for this entry derives from "Discography of OKeh Records, 1918-1934" by Laird & Rust, but I don't own that book so can't verify it. However, as Rust was a co-author, and he credits Selvin in his other discographies, I'm not sure the DAHR link is correct here.
Different sources credit different performers for "Swingin' In A Hammock". In "The American Dance Band Discography", Brian Rust claims this is Ben Selvin's Orchestra with vocals by Scrappy Lambert. DAHR claims the performer is Ray Seeley's Orchestra with vocals by Irving Kaufman. However, Johnson and Shirley note the performer as Selvin's Orchestra, using the pseudonym Ray Seeley and his Orchestra, and this aligns neighboring matrices recorded on June 6, 1930 listed in Rust's "Jazz and Ragtime Records". To confuse matters further, Allan Sutton identifies the performer as Phil Spitalny in "Pseudonyms on American Records". Rust notes that Spitalny's orchestra did record this song in June 1930 but that recording was released only on Hit of the Week.