Sporting a sleek, clean look, Walter Pedersen's driver looks unassuming, but it possesses a number of subtle features. 

The brass soleplate is beveled on its sids, so it is actually witer on the inside of the head than it is on the visible exterior. The Opening where the soleplate fits is beveled to correspond to the soleplate sides. the soplate sides into place, beginning athte back of the head, an has two inner shoulders that abut th back of the face. 

Before the soleplate is slid into placle and screwed down, a large recaugualr block of wood is placed inside the head, which is otherwise hollow. The block abuts the back of the face and in inner wall in the back of th ehad as awll as the top of the head and the soleplate.

The three visible circles on the crown are wood dowels that extend into the wood block and help hold it in place. 

Pederson received a US Patent in 1927 for his club.  Most were produced with a steel shaft. This example has its original wooden shaft and leather wrapped grip.  Pederson sold his clubs through a golf supply house bearing his name and initially located in Mt Vernon, New York.  The soleplate on this club has the "Mount Vernon" stamp.

Overall, this is an outstanding example of this more-than-meets-the-eye metalwood.  For more info on Pederson's metalwood driver, see TCA2 v1 p351