The English part of of R' Moshe Feinstein's letterhead reads as follows:
RABBI MOSES FEINSTEIN
455 F.D.R. DRIVE
New York, N.Y. 10002
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ORegon 7-1222
See for instance this letter, this letter, and this one.
What does "ORegon 7-1222" mean?
I assume the same thing it means here:

