Authentic Vintage Japanese Double-Sided Porcelain Enamel Sign – National Ink 

Up for sale is a rare original Japanese double-sided porcelain enamel signboard advertising "National Ink" (ナショナルインキ) for fountain pens (万年筆用). Vibrant yellow and red graphics featuring classic Showa-era typography.

Brand : 「みやこ染本舗」 (Miyako-zome Honpo)

Good vintage condition with authentic edge wear and patina.

Includes original reinforced mounting eyelets

1960s