This interesting group of shakers exhibits a wide variety of glaze and glaze combinations. In the 1990's Frankoma was trying to catch the eye of new audiences and the Colorworks line was part of that effort.
These shakers are not in the 1992 catalog, but are in the 1995 catalog. I do not have a 1993 or 1994 catalog so the introduction date of 1995 will remain subject to change. This shape is still being offered (12/2008) on line. The 1995 catalog list both these and a large stove top set as "Colorworks". The table shakers are numbered "309" and the stove shakers are numbered "370".
Some glazing patterns are solid one color glazes, some are a solid color with terra cotta bands. One pattern features just a clear coat over terra cotta with a few brushstrokes of accent color.
The extensive variation in these sets has mostly to do with glaze work, but one other manufacturing variation stands out: this design has two different hole set patterns. Most of the examples have the double diamond hole set with the cursive S/P, but some have a square 6/4 pattern.
Frankoma used the double diamond hole set for shakers using the S/P after the early 1950's. The square 6/4 pattern here is taken from the Milk Can series! The design of the Milk Cans does not allow for use of a cursive S/P pattern. I have no indication, however, why Frankoma chose to apply two different hole sets to this design.
Any of the glazes using a clearcoat will, like the other millennium shakers be heavily crazed, and the collector will encounter the sticker that warns not to immerse the shaker in water. The early examples of colorworks have red plugs and later examples have white plugs, provided that none have been moved.