To date a Hohner Acoustic Guitar you should compile as much information as you can. You will information like string type, photos of the headstock, bridge and inlay. Include a written description as well, the more information you provide the more accurate the dating will be. You can mail all of your information to this address; 1000 Technology Park Drive, Glen Allen, VA 23059. If you would like to send the information electronically contact email@example.com.