Dale Hall Pottery co. Covered dish with handles

This is a recent estate find. It is a covered, double-handled jar or dish. It has the Dale Hall Pottery Co. kneeling nude potter mark. It says "England" underneath.  In the mark it says "Jessamine" where the pattern name usually would go.  The pattern is floral and all in blue. I can find no reference to this pattern by Dale Hall. Im not sure if that makes it rare or a fake. There is very minimal crazing. The condition is excellent for the supposed age. Also I'm not sure what this dish would be used for.  It's approximately 6.5 inches tall.   Any help in identifying or estimating value would be much appreciated. 

ETA:  it is in need of a good cleaning. Any discolorations you see are because of this.