DesertGold/Moorcroft: https://www.desertgold.us/moorcroft/Moorcroft.html
Moorcroft Pottery CLEMATIS Designed by Walter Moorcroft Green Oval Ashtray Approximate Dimensions: 6.25" (15.875 cm) length 3.5" (1.91 cm) width Circa: 1946-1978 Stoke-On-Trent, England
Marked "Moorcroft Made in England"