Possibly from a Respected Publisher (Adachi, Takamizawa, or Watanabe). These publishers are known for producing museum-grade reprints. Some of their editions do not have visible seals. No guarantee, but paper quality and printing style resemble known reprints. ? Hand-Printed Using Traditional Methods. Raised ink texture suggests authentic woodblock printing, not digital. Reverse-side ink impression is a common feature in woodblock prints. ? Rare Small-Format Woodblock Print. Most reprints of The Great Wave are full-sized (10″x15″). This 6″x4″ format is less common, making it an interesting collector’s item. ? Not an Original Edo-Period Print (1831) – This is a later reprint. ? No Publisher’s Seal Found – This means the exact origin is unknown. ? Glue Residue on Back and slightly torn back – it was previously mounted and then removed but does not affect artwork. HOWEVER – I do offer a 30 day guarantee, this piece is very unique and you can feel the textured surface indicating woodcut pressed and you can see that it’s not normal paper, it looks like what I’ve seen online for handmade paper. I have not seen another of this size (6 inches by 4 inches).