Dear Helge,It appears that C. F. Martin & Co., Inc. is not advertising their e-mail, if they have one. In noting their e-mail address, they say "We apologize...".
You can explore their web site if you click here.
Their address is 510 Sycamore St., P. O. Box 329, Nazareth, PA 18064-0329. You can telephone them Monday - Friday, 8 AM - 5 PM EST at 800-633-2060 (US only) or at 610-759-2837. They have a 24 hour FAX line at 610-759-5757.
I hope this is helpful. Sorry, though, no e-mail.
Roger in Baltimore