I sent a letter and SAE with US stamp on to the Stage Manager on: 13th May 2013, and yesterday I recieved this signed playbill back, plus he added more postage on it too.
address I used was:
Stage Manager of ' Macbeth',
Ethel Barrymore Theatre,
243. West 47th Street,
New York
NY 10036
USA
Shaun, you are one cheapskate!
Like Spud said, that stamp is only worth $0.47. That's 30p and you can't even send a standard letter in the UK
for that. It's not the first time you have done it either. Have some respect as these places are mostly funded.