In March of 1901, Golf (NY) published a brief review of this aluminum long-nose-style putter, characterized by a block of wood in the face.  It states that this putter "is fashioned in exact imitation of an old Philp model, and the metal is artificially darkened, so as not to catch the eye.  It is weighted at three different places, the effect being that slicing and pulling are reduced to a minimum. The face has a piece of beech let in, in order to grip the ball firmly." 

In truth, there are two blocks of wood located in the face, and each piece runs clear through the head so it is visible visible on the back of the head, not just the front. (One of the pieces is slightly loose, so you can push on the face and feel the wood in the back of the head move ever so slightly.)   A lead weight on the back of the head is positioned between the two pieces of wood.  The metal on the top of the head is still somewhat artificially  darkened as can be seen behind the face.  

This putter is third from the left in the bottom row of the group image.

This putter is a William Mills LW model.  A nearly identical Mills L model putter is shown in TCA2 V2 p397. It was one of only two such long nose putters with the wood face known which the author had encountered in his career.  The example offered here brings the count up to three. 

The rarity of the Mills LW model is confirmed by Graham Walters on page 154 of his 2016 book "Sir William Mills and the Standard Golf Company 1895-1935" when he presents the LW model and writes "The LW long-nose putter pictured is one of only two semi-wood-faced putters that the Standard Golf Co produced and one of only three known to exist."  He acknowledges there that this model used two blocks of wood to form the face.

The example offered here has its original shaft and all markings on the head are clear.  The grip matches up well to the club but its origins and history are unclear. It is likely an old grip that was used to replace the original grip.

Long story short, this is a great club!