Units of Measurement

We went out to lunch while we were at the beach a couple of weeks ago. The mid-November weather was spectacular, and we sat outside on a deck overlooking the wide Patuxent river. We ordered seafood, of course: crab cakes, chowder, oysters, and my brother got a dozen clams. When they arrived, he counted them up and there were 21 in the bowl. We speculated about the number-- too many for a baker's dozen, too few for two dozen. At last we decided that it was a Broomes Island dozen. "What a deal," my brother said, and we set about calculating the cost per clam. It turned out to be three for 87 cents or there abouts. "You know what that is, right?" my brother asked. "A Solomon Island dollar!"