Do you know what the meaning of the hammer is?
Apparently a link with Vulcan, in that these coins show hammer (usually) tongs (less often) and anvil (very rarely), being the
symbols of Vulcan, the blacksmith god, and also the god of lightning from the sparks in a blacksmiths furnace.
The wellhead is in turn linked to Vulcan because it was founded at a spot struck by lightning.
http://en.wikipedia.org/wiki/Puteal_Scribonianum The Scribonian
Puteal was a bidental — that is, a spot which
had been struck by lightning. It took its name from its resemblance to the
stone curb or low enclosure around a well (puteus) that was between the Temple of
Castor and
Pollux and the Temple of
Vesta, near the Porticus
Julia and the Arcus Fabiorum (arch of the Fabii).
I have one of the very
rare types with anvil (pic below). I bought it recently - it cost just the "normal"
price for the common hammer
type, not being well known as a
rarity.
Good.
http://www.flickr.com/photos/ahala_rome/5282053479/lightbox/A pic of Vulcan below with "your" hammer and "my" anvil shown.
I found out all this information in the last 10 minutes by the way - an example of the many small joys of coin collecting in that if you
had not asked the question, I would not have gone searching for information about Vulcan.