Irwin Record vice differences

Does anyone have any information as to the differences between these two Irwin Record drill press vices ?
T414    Drill Press Vice 4” (100mm)
TPV3-B    Drill Press Vice 4” (100mm)
They are within millimeters of each other in size yet the TPV3-B retails at £18.86 and the T414 retails at £106.92 (ex vat prices from Lawson-HIS)
Is one really five times the vice of the other ?
Where can the cost benefit be seen - accuracy, play, solid gold jaws ?
Adrian.
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According to this site http://www.activeeducationsolutions.com/products/default.aspx?id08&n "3&cid=0&rid=0&catid=0&pid„9 the T414 is machine finished on the important surfaces. I assume the TPV3-B is a cast finish.
John
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