I'm not sure if this is considered an antique or collectible--I have a 1908 home in Spokane, Washington. Our washing machine (until recently) discharged into a very large concrete wash basin. Imprinted on the basin is a large swastika. In an oval around the swastika it reads "Seattle Concrete Laundry Tray Company" with a "Trade" and "Mark" on either side of the swastika. I was able to disconnect it and move it, with 3 other men helping me. Anyone know of a possible range of age? I have no idea if it has value, and not quite sure what to do with it? Not sure if I want to display something in my yard with large swastika on it. Thanks for any info.