Yunomi, gp mark

Bought from eBay as yunomi, this attractive little pot is faceted, olive green, with a nicely turned foot. It is heavy, the walls are quite thick, and the rim is uneven, yet I have seen all these described as characteristic of yunomi. Yet it seems too big, about the size of a mug. Height 13 cm, diameter 13 cm, weight 353g. Initials on the bottom gp, incised or stamped, I cannot tell...please tell me what to make of this?

Please allow me to amend this - l reported the measurements incorrectly.  Dimensions are: height 9 cm, diameter 9 cm. Not sure if mark gp is inscribed or impressed.  Should I think of this as professional yunomi or is it a student piece? I would very much appreciate your opinion, many thanks.

I think it’s impressed but not one I’ve come across before