There is a wonderful vintage shop in downtown Ft. Myers. I never miss a chance to visit the shop when I am lucky enough to be in Florida. I always find a treasure there, and on one visit I snapped up the square serving dish in this photo. It became my go-to piece to heat food in my toaster oven. The winsome tulip motif and color combo always makes me smile. The back is marked “oven proof not open flame.” Years later, on my lunch hour, I found a teapot and a little covered soup dish to match, adding more happy dishes to my small collection. They are unmarked, but I learned that these mid-century pieces were made by an Ohio company called Cronin China and there are many more pieces in this blue Tulip series. There are even sets that have a yellow background color instead of the turquoise. The grocery store, A&P (which I remember from my childhood in Ohio during the 1960s,) gave these out for in-store promotional premiums. Some say that the Tulip pieces that are usually attributed to Cronin China were actually made in West Virginia by Cameron Clay Products. Does anyone out there know more about this?