I found this info on Gemeinhardt headjoints:
http://www.gemeinhardt.com/catalogpage.asp?mode=PRODUCT&productid=65
I can think of two reasons why you'd ask this question:
1. You are interested in a new flute, and Gemeinhardt is something you are interested in.
2. Someone is offering you this specific flute at a good price, and you're wondering if it's a good investment.
Answers in my semi-professional opinion:
To situation 1: Gemeinhardts are standard intermediate material. I (and my profession flute tutor when I studied) preferred yamaha, but I do believe the difference is a matter of taste rather than worth.
Situation 2: This particular flute isn't in production anymore, and it seems there are more of these on sale than there are buyers. Gemeinhardt and yamaha update lots, so they don't seem to hold their value like maybe Haynes, Powell, Muramatsu, etc. would. I wouldn't purchase it for a lot of money, but if its the flute for you, who can really put a price on comfort and ease of use.
Andrew
Miyazawa 602 body, Drelinger Headjoint
Burkart Resona piccolo