http://www.google.com/patents?id=Z7ZZAAAAEBAJ&pg=PA1&img=1&zoom=4&hl=en&sig=ACfU3U1_LuYlnC4Lia5VKEHR8ufXM9znmA&ci=108%2C368%2C796%2C915&edge=0
Yours looks to be one of the last versions made (around 1915) and has more of the distinctive Dietz tooling and the added wall hanger. The one shown in the 1913 Dietz catalog is more like the Irwin patent drawing. I have one of the first ones and will post a pic when I get my photo riff together. BB
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