vintage Japanese Arita ware porcelain, mint condition set of 5 plates w/ original label

Set of five blue glazed porcelain plates marked with characters (we can't read this signature - sorry! - but have shown the mark in different directions as we're not entirely sure which way is up).

These are Arita porcelain, we think - a perfect set as we've been told that sets are often sold in fives. One of these plates has the paper price tag, but there's no date. They're 20th century, probably vintage, but not antique!

There's a fine brown (iron oxide?) rim on each border, and the design of the plates is slightly raised under the glaze. These all have the same scene, a harbor or lake with trees around it, a ship and the mountains behind it. The plates measure 5 1/4" in diameter.