Vase signed GRM Guy-Roland Marcy?

Here is a very beautiful ceramic vase with elegant lines and a magnificent glaze in very soft speckled blue tones, enhanced with beige, which gives it a very cozy, very natural appearance. Whatever the angle of view, the glaze is different, difficult to choose which side you want to show it from, or you can rotate it every day. It is a very beautiful artisanal work of throwing and glazing. It is signed "GRM" underneath, a signature regularly attributed to Guy-Roland Marcy (1925 - 90s), but for my part, no certainty at the moment. His work has evolved a lot over time, like his signatures and marks, so if this vase is by him, I would lean towards a ceramic from the beginning of his career, in the 50s, when he did not yet sign with his name in full, nor with a stamp. Investigation to be continued therefore. This vase is in good general condition, no cracks but two small chips on the rim of the vase, fortunately not too visible because "melted" into the beige color. It measures 23.5 cm in height and approximately 17 cm in maximum diameter.