Sunfire Cinema Grand Signature Series I &II Amps

How can I tell the difference between the Signature Series I(405w/chan)and Series II(425w/chan)by looking at it?If it's the Architech's Choice model(17"face) will it say so on the faceplate?
I'm no expert, but I think the signature series actually has Bob Carver's signature on the bottom left of the faceplate. Hope this helps.