Both this diagram, and the one that I was replying about, are of a desk stand, not a 202. Despite the fact that the hookswitches in both diagrams are drawn as if they have 2 pairs of contacts -- as the Y/BK and the GN/W in a 202, if you look closer you will see that the contacts are labeled R/W and R/YY. In fact, both Rs are the same contact spring, and the 3 springs make to complete the path from the R terminal to both the transmitter (YY) and the receiver (W)....The first diagram also has "desk stand" designated in blue.
So the transmitter and receiver are separate units, not a handset.
With 3 contact hookswitch, 4 conductor handset cord would be required. But a 202 has a 4-contact hookswitch.
Hopefully, unbeldi can better clear up the ambiguity of the two R contacts in each drawing.