R. Mars The Contract Co. ash tray

From an old contractor company, based on what seems like a single digit zip code (if anyone can clear that up please elaborate) it seems probably from the 30's or 40's.
It seems they had offices in D.C. New York, and Baltimore.
The text on the tray is painted on the bottom and reads: "Everything for home hotel institution."

I'm not sure why that wide net of advertising intention seems odd today. I mean it isn't odd for all those groups to be buying the same sort of item, what seems strange I guess is that you never see one single piece of advertising aimed at the home, hotel, AND institution.