I have found these two marks the be the most common.
< The Fair Week mark usually shows up on covered sugars and creamers.
This mark is on a creamer. > The matching covered sugar has the Austria mark.
The tray below (15 3/4" x 7"), is one of our favorites due to the inscription.
We read this as "Our first china 1915"
While on the subject of trays, the style on the right (8 3/4") is no surprise. The other (9 "x 6 1/4"") came as a pleasant surprise. Both have matte bottoms.