This is a Showa-era retro promotional novelty mug from Japan Sogo Bank.
According to online research, Japan Sogo Bank changed its name to Taiyo Bank in 1968, and through subsequent mergers eventually became what is now Sumitomo Mitsui Banking Corporation (SMBC).
Based on this history, this mug is believed to have been produced before 1968.
Size (approx.):
Diameter: 5.5 cm (2.17 in)
Height: 11 cm (4.33 in)
The mug has not been used, but it has been stored for a long period of time.
Please note that there may be minor signs of age or storage wear.
Condition details can be confirmed in the photos.
Please purchase only if you are comfortable with vintage items.