Blue with Lighter Blue Older Looking Vase with An E. Do you know maker?

I bought this older looking vase with I think an older blue and lighter bluish glaze. There is a smallish capital E impressed in the bottom which is almost too lightly impressed to see or I suppose it could be a 3 pronged rake pointing down instead of an E. Does anyone recognize the glaze technique or know what the smallish capital E impressed on the bottom stands for? I bought at a thrift store. It measures 8 inches tall. I apologize because there is glare and reflections in the glaze in the photos. Any help would be appreciated. Thank you.