I found this one yesterday in New Hampshire and just thought it an interesting and evocative object, with arrows that can be positioned to point straight up or due west. I've done a bit of searching but can't find another like it--I assume it would have been positioned on a wall inside an office building or hotel (or somewhere large enough to have three front and three side doors), with arrows turning to indicate when a particular doorbell was being buzzed. The backside reveals the mechanics, with levers that can be raised or lowered manually to move the arrows. (Some still work, others not so well.) In addition to being interesting graphically, it makes me thing about who was directed to enter through the front doors and who through the sides and everything embedded in that.

9 1/4" x 5 1/2" x 1 1/2" d.  Wear and paint loss as documented, with mechanics partially working. There is a bit of separation between the painted top painted metal sheet and backing plate at the corners, as documented.