I haven't found much on the Walter Addison who made this trivet, except for an auction record for a beautiful ceramic lamp from a Rhode Island estate sold at auction that noted his dates as 1914-1982. I found this and one other, listed separately, together in Connecticut, attributed to him by the seller (the backs are signed simple Addison) and just thought they were lovely. Definitely mid-century, with satisfying matte glaze. I love this one for feeling a bit like a play on a target (perhaps a nod to Jasper Johns?) and with (not quite) squares inside of squares as if an homage to Frank Stella too.  Plus great color for the kitchen or table or wherever.

6 1/2" x 6 1/2" (measured on the square) x 1/2" and in very good vintage condition, no chips, cracks or other issues, just one very light surface scratch, not noticable unless you are looking for it.