He paused and had himself a sip of coffee, used a napkin to blot a thin line of whipped cream from his upper lip. "The coin was issued without interruption through 1912," he continued. "In 1913 it was replaced by the Buffalo Nickel. The Mint had problems with that issue, too, in the first year. Originally the mound on which the bison stands was in excessive relief and the coins would not stack properly. This was corrected, but the dates of these coins tended to wear off prematurely. It was a poor design.

"But I am telling you more than you would care to know. The last Liberty Head Nickels, or V-Nickels, as they are sometimes called, were struck in Philadelphia and Denver and San Francisco in 1912." He paused again, breathed in, breathed out. "The specimen you were so kind as to bring me tonight," he said, "is dated 1913."

"That must make it special," Carolyn said.

"You might say that. Five specimens of the 1913 V-Nickel are known to exist. They are clearly a product of the U.S. Mint, although the Mint has always denied having produced them.

"It is fairly clear what must have happened. Dies for a 1913 V-Nickel must have been prepared before the decision to switch to the buffalo design was finalized. Possibly a few pieces were struck as the trials; alternately, an enterprising employee may have produced these trial pieces on his own initiative. In any event, five specimens left the Mint by the back door."

He sighed, removed one of his slippers, massaged his arch. "I carry too much weight," he said. "It is alleged to endanger the heart. My heart makes no objection but my feet protest incessantly.

"But no matter. Let us return to the year 1913. At the time, a gentleman named Samuel Brown worked at the Mint in Philadelphia. He left shortly thereafter and next emerged in North Tonawanda, a suburb of Buffalo, where he placed advertisements seeking to buy 1913 Liberty Head Nickels-which of course no one had heard of at the time. He subsequently announced that he had managed to purchase five such nickels, and those are the only five which were ever to see the light of day. Perhaps you can guess how he happened to get them."