Parker Hannifin 1/2" NPT Tru-Flate Chrome Coupler

Description

This is a large bright chrome finish coupler.  Measures 4-1/4" by 1-3/16" in diameter.
The only marking on the male side is:  T-F   and   B2F
It is in excellent condition - a real showpiece.  I believe it was a salesman's sample.
See the photos to appreciate this rare piece.
Thanks for looking.