The 18C is the smallest of the Super-Vulcan hammers, designed to correspond with the Warrington-Vulcan #3. Specifications for the hammer are below.
Bulletin 70F Specifications
Bulletin 70D Specifications
Bulletin 70A Specifications
Like the #3, the small size made it lose popularity, and it lasted longer in Vulcan’s literature than in active production.
One interesting footnote to its history is that the 18C was the smallest Vulcan hammer to sport a McDermid Base; the Vulcan #3 did not.
vulcanhammer.info 
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