Retrolicious sign: Get your 'Zerox' copies at Phil's Stationery

The sign for Phil’s Stationery at 9 E. 47th St., is one hardy and hard-to-miss holdout.

Its bold shade of yellow, mix of fonts and little mid-century stars compel contemplation.

And as we did just that, I noticed a small tag for Sign World, the company that created it. That tag itself carries a little old-school surprise: It bears an old telephone exchang…