Triangle Perfin On Scott 506...anyone Know What Company Used This Geometric Form?

Hi

Came across this Perfin in the shape of a triangle. Typically the perfin is used to identify ownership of a stamp by a Company as a means to deter employee theft. Unique letter combinations are used. I have been trying to locate the name of the Company that used this simple geometric shape instead of initials. Anyone come across this type of perfin before? If so, could you identify the firm that used it?

Used by United YMCA Schools NYC, D-rated, fairly common

Thank you chasa.