Does this shape appear in other series? Probably - the shape book entry for 137-8 lists it as being the same as 'A' Series / Kerryl A108, but there is no example recorded in the image database. The shape book sketch for Later Series 185 (in the agate-ware range) also resembles 137 but of intermediate size.
Early Series 203 is somewhat similar but its pedestal is solid, not open as here.
There were two size variants; 137 & 137-8
Previous number in Later Series Next number in Later Series