I have an old buffalo pottery pitcher. It is white with a cobalt blue iris pattern. It measures 4 5/8 in tall by 4 1/4 in wide. I cannot find this pattern or this pitcher anywhere. Does anyone have any idea of what I have? It has the stamp of just the buffalo on the bottom, it says “semi-vitreous” above the buffalo and “Buffalo Pottery” underneath, and there is a small number 4 off to the side on the lower right side. I would appreciate any help or feedback I could get. Thank you!