what does 925M814 mean stamped on band of ring?

[MGnFF224]

I know what 925 stands for. But I can not find anything at all about what the "M814" stamp means. Can anyoneout there please help. Thus ring was passed down to me from my great grandmother and I've always been confused by it. I've done hundreds of searches and nothing has come back that can explain it.

[dognose]

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