Vulcan Studio

Anthony Guyther sold his photographs of male models under the name of Vulcan Studio in New York city from the late 1950s through the early 1960s.  

Tristan Rohr, like many of Guyther's models, was exclusive to that studio. 

Guyther frequently photographed many of his models fully exposed.  Here's Bob Delmonteque in a reclining position and looking somewhat aroused.