Only way you might find that specific item is with a catalogue of their items and the number or where someone has information and posts in on the internet somewhere and I didn`t see anything similar !! Most information is divided into groups !! If you think its an ashtray then look for other ashtray`s by them and cross your fingers that you run across it !!
Did some checking and even though the comic characters are what they are most commonly identified with,, they did other items as well !! I found teacups and other tableware and read that they also made jasperware !! They were a smaller company and did not find much on their products !! This site (Kovels) has some information so try a site search here first !!