Hi Mary;
Your attachment set is for a #9 machine. I am giving a link to a picture of 4 W&W feet from our photo albums.
left to right the first one is for the curved needle machines. 2nd is for a #8, 3rd is for the #9 & 4th is for a D-9. Note that dimensionally the shank is the same for the #8, #9 & D-9 thus they can be switched with the difference in the method of changing. To use the #8 foot on any model you have to remove the clamp screw in order to remove or insert a foot. For the #9 you simply loosen the screw & insert or remove the foot from the right side while on the D-9 it is done from the left side. The D-9 presser bar will accept a foot from either the left or right. The #9 bar will accept a foot only from the right unless you remove the thread cutter.
Note that during the #8 & #9 era most all the attachments were made to fit the cleft foot, same as the glass inserts so the foot itself did not have to be removed for every attachment change. With the D-9 most all the attachments carried their own shank most were equipped with an all metal straight stitch foot so the glass inserts seem to have been gradually phased out during this 1895-1905 era.
Miller/TN
Mary T