Had to go find a pic of mine; sure enough, no logo.That advertisment shows the Thunderstar with the chrome Guild logo on the front. Not sure if Guild ever sold them with the logo as everyone I have seen didn't have it. Similarly for the Superstar. The Thunderstar uses 7591 power tubes that sound great when cranked up. The novel mounting of the 12" speaker tends to attenuate the low end response.
M