Distinctive Scraffiti Decorated pots - Weird Mark???

Looks like a Japanese mark but the pots look factory made

The Japanese have an amazing ability to make pots that look handmade or have a handmade element in them, but the glaze looks sprayed on, to mimic anagama firing. An individual potter would use a real anagama kiln

Check out Seto ware, a yellow glazed earthenware pottery, made in Seto City and the Aichi Prefecture, Japan. Has some similarities, including the sgraffito design, as your vases.