#110, Soho, NYC
Cool, classy old school number plates like this one pop up all over lower Manhattan, especially in Soho. Once you start looking, you'll notice them on the sides of the buildings in inconspicuous places, usually some distance away from the front door. You can find lots of good number plates like this one (I like the monochrome and the squared edges of this 110), but I'm amazed at the number of missed opportunities: buildings that have the decorative plate without the number. Instead of placing a row of digits ceremoniously in the middle, there will be some slapdash hardware store gold sticker address numbers plastered artlessly to the glass of a nearby door. They don't make 'em like they used to, but at least they preserve 'em.