When I saw the Hawaii Uniface SCD HK-537 being offered for sale I jumped at the chance to own it. I've look hard and far to have one in my collection.
This well known dealer convinced my to purchase the Alaska Uniface SCD HK-536 in order to keep them as a pair. It was good that I listened to him.
These two medals are currently the only pair graded by NGC (or any other TPG company).