Catcher's Mitt vs. Fielder's Glove

[tankmjg24]

My interpretation of the rule is that either no mitt (who in their right mind would do this) or a catcher's mitt or first baseman's mitt has to be used. The strict reading of the rule says "may" and "mitt". OBR Rule 1.12 states:

The catcher may wear a leather mitt not more than thirty-eight inches in circumference, nor more than fifteen and one-half inches from top to bottom. Such limits shall include all lacing and any leather band or facing attached to the outer edge of the mitt. The space between the thumb section and the finger section of the mitt shall not exceed six inches at the top of the mitt and four inches at the base of the thumb crotch. The web shall measure not more than seven inches across the top or more than six inches from its top to the base of the thumb crotch. The web may be either a lacing or lacing through leather tunnels, or a center piece of leather which may be an extension of the palm, connected to the mitt with lacing and constructed so that it will not exceed any of the above mentioned measurements.