WANTED: Buying Old Silver Bars Vintage Silver .999 Bullion Bar

Hi, I am a vintage silver bar collector. If you have any older release .999 Silver bars from 1/2 ounce to 5 ounce, or perhaps bigger, I probably am interested in buying. I am not interested in newer release bars or rounds. Paying over the daily silver spot price, and more than the shops/retailers, and even more for harder to find vintage bars. Thanks...