Hmm...well come to think of it, you did get the first run of them man. Mine is brand new 2006 model...I'm not worried. My 5150 combo was the first run they did with the signature plates instead of block letters...so it was old, and it never gave me a single problem. My 5150 head is the signature plate as well, I think around the same production time as the combo I use to have, and with that as well no problems.
~e.a
~e.a