Apparently "old collection" - mines producing this type of material from the Tristate District (OK, MO, KS) were active between 1850 and 1960 - plus you see the tagging on the bottom (3rd picture). Very harmonious display piece, circular, and with wonderful crystallization. In pencil, on the side, is written "sphalerite" - presumably due to some happening on the Galena - prize specimen. We entertain serious Best Offer inquiries, and always provide discounts when possible. Remember, we have many more items OFFline than online, so feel free to Message us with your special interests and we'll see what else we can post. Open to reasonable Best Offers.