Is the overspin putter legal

Answer 1

No it is not a putter must be upright at least .5 of a degree and not have a multi level face

Straight from the USGA rule book:

A club is an implement designed to be used for striking the ball and generally comes in three forms: woods, irons and putters distinguished by shape and intended use. A putter is a club with a loft not exceeding ten degrees designed primarily for use on the putting green.

Answer 2

An overspin putter is considered legal for use in Golf as long as it conforms to the rules and guidelines set by the United States Golf Association (USGA). It is always advisable to check with the governing body or tournament officials before using any new equipment to ensure compliance with the rules.