½ Dollar California Territorial Gold "Round Liberty Head"

Kroll & Kroll operated out of San Francisco during the tail end of California's fractional gold boom, producing small-denomination pieces that filled a genuine gap left by the U.S. Mint's refusal to strike coins below 25 cents. Congress eventually closed that gap forcibly — the Act of January 9, 1873 banned private coinage of gold pieces under $1, effectively ending the entire fractional gold industry. Most survivors were hoarded as novelties almost immediately after the ban took effect, which explains the disproportionate number of high-grade examples relative to the short window of actual circulation.