Those famous words as delivered by Sir Alistair Sims playing the infamous "Ebenezer Scrooge" ring in my head as I read about the Knutsen label found in the Dyer Sunburst HG described in "A Dyer Detective Story."
That label seems to be the "fly in the ointment" so to speak. If it were not for that, the scenario of it's being one of the last Larson Bros. built HG's (possibly a one off custom) would be a perfect fit. So, we need to know more about the labels in general and this one in specific. Like who had them printed and where? I suspect they were commissioned by W. J. Dyer & Bro. and here's my theory as to why.
W. J. Dyer & Bro. might have paid a fee to Knutsen up front for the rights to construct and sell instruments based on his patented design. But more importantly, Knutsen would have received a separate royalty for each individual instrument constructed during the term of the agreement. So how would they have kept track? Simple, Knutsen would be paid for each label he signed. Dyer could have had hundreds printed up in advance but, would have sent Knutsen only as many as were needed for a specific time frame. He in turn would only sign as many labels has he was paid for. Hence, his signature and the serial number, style info will never be in the same hand writing or pen / pencil type. Furthermore, his own labels vary widely whereas the Dyer labels are very consistent.
What does this mean? Well. if it's a signed label than it and the back it's attached to are pre 1912. Dyer would have had no use for those labels after the agreement had ended, (signed or otherwise). Modern forensics should be able to determine if that label was every signed.
If however it proves to be an unsigned label I would suggest it was placed there to make the instrument seem older then it is, (pre 1912). Why? Well, to enhance it's value of course. Even if it was done back in the late fifties. I grew up in a museum of a home. My father was a collector, a care taker of antiquities if you will. (My mother called him a pack rat.) Anyway I learned at a very young age that anything that was or might become collectible was fair game for fakery. Buyer beware.
After all is said and done my own scenario goes like this. It is a pre 1912 that was "updated" in the thirties. And it was probably done to try and make it more saleable. Like a used car lot taking a drab coloured faded old car and re spraying it a bright flashy colour.