WY phone exchange, midtown.
According to the Telephone Exchange Name Project the WY exchange seen here is either a no-name exchange or else WYoming or WYandotte, the latter of which was a Bronx telephone exchange.

J De Martino Sea Food, COlumbus phone exchange
The COlumbus phone exchange can be seen on this old sign at the J. De Martino Seafood on 9th Avenue in Manhattan. How many times had I seen this sign before cracking the code and noticing that the phone number started with letters and not numbers?

DEwey 9-6464. Arthur Blum Signs.

Discarded Umbrella Carcasses, NYC

TWinings.4-9228 - Laurel Manufacturing Company in Maspeth
The Laurel Manufacturing Company in Maspeth used to be reachable at its old TWinings number (TW.4-9228) but today you could try them at (718) 894-9228. The TWinings exchange was new to me when I saw it, and before looking it up I imagined it might mean a lot of things: TWinkletoes. TWister. TWiddle-dee-dee. Time-Warner.

LOngacre 1-8010. Triboro Neon.