Japanese Glazed Pots

The two of these pots are still stained from years of being buried however, they both still have their glaze and are quite beautiful even with the stains...but other than the stains they are in almost  perfect condition for their age...

I am seeking information of age, history, value if any....especially the meaning of the symbols on the base.

They both have the same symbols engraved on the base and the lighter pot is slightly taller and larger than the darker one. They are both quite light in weight.

I have been told they are antiquities but I cannot find any info on the symbols on the base.