Signed ball vase, handmade ceramic

Here is a very charming little ceramic "ball" vase with a beautiful "cloudy" glaze in old blue color enhanced by some darker "rings" and beautiful sober and harmonious lines. It is a beautiful handcrafted work of turning and glazing. It is signed underneath in hollow by hand by the artist who made it, but I have not been able to identify this signature for the moment. It also includes the mention "arc", perhaps the name of the workshop where it was made. It could date from the 80s but without any certainty. It is in perfect condition, no defects to report, not even a chip. It measures 6 cm in height for a maximum diameter of 6.5 cm. I am also offering here a second small vase signed by the same ceramist (see last photo).