Was wondering how many different styles of Tech heads there are relative to the logo on the top of it. On the forum I have seen one that has the Gillette triangle with the name Gillette inside it that looks etched. I have seen one with just the name Gillette, again looks like etching, and the letters are "broken". Mine has the name Gillette on it, but it looks more stamped than etched. Do these variations indicate when or where manufactured? Are there more variations, no name/logo at all? Thanks, John