Hi i hope this give you some clearence.

Mark: “M” for Morimura in a wreath, crowned by “NORITAKE” and below, “Hand painted” and “Made in Japan”. This mark was registered in 1918 and seems to have come in to used in the early 1920’s when it was used until around 1940

https://www.collectorsweekly.com/asian/nippon-porcelain

It is a Nippon mark !! Many of these were made in hundreds of patterns !! Do you have the cup to go with the saucer ??
The link above will give you some information !!