Silver is a limited run color? (So much I haven’t learned yet, lol)
I’m pretty sure (and someone can correct this if I am wrong) that the limited production pieces are all identified on their store listings. So if you check the Silver Spectral, for example, it says “Limited Production, unsigned” at the bottom of the description. And yes, some of the limited production pieces were signed at one time, but I don’t think that Melody does that any more.