Not the smallest commercial model scale, but the smallest I have managed to produce signs for. Street signs are visible to naked eye, house numbers are just visible magnified! Station names available, specials on request. Other signs are just too small, but it might be possible to use some of the prints produced for other scales. 

 

I have found one of the original prints, the station signs, and recreated some of the other signs using other scaled originals/

All should be printed off on 6in by 4.5in photo paper. 

1/144-160 scale