Patented by William W. Davis in 1904 and made by and marked G.S. Sprague of Boston, the Sprague adjustable putter can be used left-handed, right-handed, or croquet style.  To adjust the shaft, the locking ball joint mechanism in the center of the head has to be unscrewed.  This is done by holding the head firmly in one hand while turning the hosel with the other hand.  After the ball joint becomes loose, the shaft will swivel in any direction.  Once repositioned, the shaft is locked in place by holding the head and turning the hosel in the opposite direction.

The head is soft aluminum and shows wear but not abuse.  It is in good working condition. This example has its original shaft and original underlisting.  The grip that was once atop the underlisting is pretty much gone. Even so, this putter remains a 115 year-old mesmerizing mechanical marvel!

TCA2: V2, p467