I just took apart a picture frame to scan the photo. Backing the photo was a piece of cardboard that was actually a blotter. Remember blotters? We used them all the time when we used fountain pens--another lifetime ago.
The blotter was a piece of advertising from a printer in downtown Manhattan. It reads, DO NOT WAIT - Order your 1963 Diaries & Calendars AT ONCE. The telephone number is CAnal 6-3465. Our home phone number had a RAvenswood exchange.
It seems like a long time since telephone numbers used a word as an exchange. I don't know when they disappeared; do you? Do you remember one that you had?