earthenware vase signed s + g

hi, i got this vase a little while ago...i don't normally collect earthenware but i really liked the handpainted fern....very beautiful. the vase is in mint condition. it is signed with S+G and then a B. i have been looking at american earthenware but it doesn't quite match anything so far....if you know what it is, please message me and thank you (in advance)...sorry about the lousy pics i will take some more pics in the daytime and see if that gives a better picture. love this site!