On the main page of this site: http://cs1904.com/ there is a cropped photo showing the Schlechter-Lasker game along with a back view of the clock. The height of the back of the clock from the bottom of the wooden base to the top of the circular clock frame is just under 5 inches. Again, this may help assess the height of the pieces in the picture.
Steve, given that there is some misinformation circulating in the public that the King size of the sets used during the Cambridge Springs tournament was St.#8 (4 5/16th inches), it might be nice to compare the pawn size in the Shipley image to where it is shown against the Waterbury clock. Note that the Kings in the tournament sets are not much larger than two pawns stacked or even better two Rooks atop as anyone can easily see in the image. Clearly the Kings are smaller than the combined Rooks and not even close to the top of the clock in the photograph! I know we took measurements during our initial reconstruction session and am looking for that now.
Cambridge Springs 1904 (cs1904.com) image of Schlechter-Lasker game from WPShipley 
Cambridge Springs chessmen and vintage clock image taken 08/30/2018 
  











Images taken on 08/16/2021 me & Steve


















I tried to repost your picture right-side-up but Chess.com is being stubborn.
Done!