WONDERFUL ESTATE FIND RING THAT HAS ON THE FRONT ” HOSPITAL CORPS ” + USN, WITH A BIG BLUE STONE IN THE MIDDLE sapphire? ON ONE SIDE IS USN WITH AN ANCHOR AND STARS… ON THE OTHER IS THE CADUCEUS SYMBLOL OF A STAFF ENTWINED BY 2 SERPENTS… THIS IS IN EXCELLENT USED CONDITION… I BELIEVE THAT IT IS A SIZE 9, BUT I DON’T KNOW HOW TO READ THE RING GAUGE (see the picture for the right size)…