[TheForge] The Cats head hammer Hype

[TOOL GYPSY]

I ask this question mostly out of curiosity.I saw a couple of heller bros 
cats head turning hammers go for well over 100.00  on ebay.Are these hammers 
  something every smith should have?Are they only really usefull to a 
farrier? or is it that they are a rare item that collectors seem to want? 
would appreciate any responses .
                                                                            
Paddy P

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