The original knives are not marked Hen and Rooster and do not have a shield. They are stamped with the name of the company that distributed them. Look for either Voss, Gutmann, Carter, or several others (found on this page
http://www.henandrooster.com/aboutus.aspx) on the tang, with the reverse side having the Hen and Rooster logo. The originals, made by Bertram in Solingen are not marked Bertram or Hen and Rooster.
Later knives were also of good quality, but noticeably different from the originals, which had a nearly custom level of fit and finish. They eventaully went to Asia, as I understand, and the quality went downhill.
Any of the German made ones are good, and they should be stamped Solingen Germany. Ones also stamped Bertram are from the 80's onward. On the originals, often times Germany is stamped under the distributor name and Solingen on the reverse, under the logo. Ones stamped only Germany are, as I have been told, Asian knives made with German steel. Ones with no national origin are pure Asian, again, as I have been told.