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williamMark - your glove is a first baseman's mitt.
Generally speaking, based on what I've handled, a fielder's mitt has many of the same characteristics as any other top of the line fielder's glove. Rolled piping, thicker leather, etc. I've also never seen one with anything other than a sewn full web. The shorter finger stalls and thinner padding, and the ability to close the hand similar to a glove, are also giveaways. This last part is hard to verbalize, but, whereas you put a baseman's mitt ON your hand, you put your hand IN a fielder's mitt. Early first base mitt's tend to have the user's hand on the back of the glove will all the substance on the palm side. The hand is more centrally located in a fielder's mitt.