Vintage Retro Ceramic Ashtray ~ Large~ Eames Era ~USA

I am almost positive this is a McCoy Ashtray due to the way "Made in the USA" written. It is written exactly like some of my McCoy Pots that say "Made in the USA" but are shown in the McCoy Book. The ashtray is rectangular and measures 9 & 3/8 in. X 6 & 1/8". It is a glossy brown with darker brown streaks and has sea foam blue on about half of the side opposite the place that is made to rest the cigarette. This would make a beautiful piece of a 60's art to put in a holder for display. It is in very good condition except for a slight chip on the bottom but is not noticeable unless you turn it upside down.