The Gold Sicker was certification that they were narrow band, in the old days when one entered a large contest, or at a show they would check them and add the sicker if it passed. Silver Sicker was that it was not, but good enough till they added the odd channels. I suspect that all the Kraft FMs were, but am not 100% sure. An FM Kraft transmitter is very desirable then the AM as you can use some of the new receivers on it. Alot of us like the old nostalgia and such.