How to Identify the Irish Gun Money Halfcrown (30 Pence)

Start with the metal. Gun Money is a copper alloy coin, not silver, so a halfcrown-sized piece that is clearly base metal — often with a brassy or brown tone and, frequently, some corrosion — is the first sign you are looking at Gun Money rather than an ordinary silver halfcrown. Genuine silver coins of the period ring differently, resist corrosion, and show a grey patina.

Read the obverse. Expect James II in profile, usually laureate and facing left, inside a Latin royal legend and a beaded border, as on the 1689 example here. Confirm the king's name in the legend, since the portrait style resembles other Stuart coinage; the combination of a base-metal flan and James II's titles is what points to Gun Money.

Turn to the reverse for the clinching details. Gun Money halfcrowns typically show a crown above crossed sceptres, a Roman-numeral value, and — critically — a month alongside the year. That month-and-year dating is a hallmark of the series and rarely appears on other coins, so it is one of the strongest confirmations you can find. Note the month, as it feeds directly into cataloguing the variety.

Judge the size and module. The halfcrown is the largest Gun Money denomination, well above the shilling and sixpence, and collectors further divide it into larger and smaller halfcrowns struck as metal grew scarce. Weigh and measure the coin against published specifications for each module to place it correctly and to flag any piece that is badly underweight or altered.

Authenticate with care. Because Gun Money is popular and historically charged, cast copies and modern reproductions exist. Watch for casting seams, bubbles, unnaturally smooth fields, or soft, lifeless lettering, and be wary of pieces where the date or month appears tooled or re-engraved. For scarce months, overdates, or high-grade coins, seek an opinion from a specialist in Irish coinage or a reputable grading service before purchase.