I have a customer switching screen printers. All he has is this sample of the font and I need to identify it.



There are several freeware blackletters that are a pretty close match for this. Take a look at Portcullion by Paul Lloyd at Font Squirrel, or Dieter Steffman's Blackletter at the less reputable fontspace.com. For a commercial variant there is Black Rose by Michael Hagemann via myfonts.com.

Any of these could be easily tweaked to match your sample pretty closely.