I've purchase bullion from Northwest Territorial Mint, and they always post sell and buy rates based on market spot ask and bid (with a premium on ask rates). As far as I can tell if you have purchased products from them (as I have never sold any of my bars), you can resell for the current bid price.  I've purchased their privately minted 100oz bars, and see no difference from other products they sell produced by Pan American Silver.  There does not seem to be a premium value in the name for bars anyway.  Silver coins is a different story, with different coins like Eagles and Maples priced differently than Pandas, Kangaroos, Mexican coins, etc.  I prefer bars myself.