This isn’t doo wop hero Anthony Gourdine from the Imperials, but rather Anthony Bellante who cut this deep obscurity in Dallas, TX. His voice has a rather nasal tone to it, but the emotional strength is plain during his committed singing on his own song You’re My One & Only. The arrangement is good too, particularly on the stop/start bridge. A one-off 45 it seems.
UPDATE ~ My friend Greg Burgess has found this link here to Anthony Bellante's continuing career in the music business.
You're my one & only / Nobody but me ~ SHOW ART 101/2 (1967?)