Impressed WPF is a mark.
There is also a round impressed mark that says Williamsburg Pottery with a VA in the middle.
Seems like there are about a million other marks.
Not sure of what the difference is between those marks.
Decorators also sign their work. One signs TT.
Started by James Maloney as a small pottery studio in 1938. Started with salt glaze reproductions of 18th century stuff. There were some multicolor pieces that looked a lot like Cole stuff.
References:
https://en.wikipedia.org/wiki/Williamsburg_Pottery_Factory
https://www.visitwilliamsburg.com/shopping/williamsburg-pottery
https://www.dailypress.com/news/dp-xpm-20050719-2005-07-19-0507190097-story.html