Vintage Japanese enamel advertising sign featuring the bold Japanese slogan "3倍 とくする" (3-bai tokusuru), which can be interpreted as "three times more advantageous" or "three times the value." This is an old Japanese commercial sign with a striking red, yellow and white colour scheme. The large, simple lettering was designed to be clearly visible from a distance, making this type of sign suitable for display outside a shop or at a retail sales point. According to the previous owner, this sign was associated with advertising for rubber boots made by Kohshin. Kohshin Rubber is a long-established Japanese manufacturer whose history dates back to 1935 and which has historically manufactured rubber footwear, including work and rubber boots. However, no manufacturer's name, logo or other marking identifying Kohshin has been found on this particular sign. Therefore, the attribution to Kohshin cannot currently be independently verified and is mentioned only as information provided by the previous owner. The exact manufacturer, advertising campaign and production date of this sign are unknown. The sign is made from enamel-coated metal and was designed for single-sided display. There are mounting holes near the four corners, indicating that it was intended to be fixed to a wall, storefront or other structure. The sign shows substantial signs of age and use. There is rust and enamel loss around the edges and mounting holes, together with scratches, stains and surface wear. The metal plate is noticeably warped and bent in places, particularly around the edges and corners. The reverse side shows extensive oxidation and traces of old paint or surface residue. These imperfections are clearly visible in the photographs and form part of the authentic aged character of the object. Despite its worn condition, the vivid red and yellow background and the large white Japanese typography remain visually impressive. Old Japanese enamel advertising signs were practical commercial objects rather than decorative reproductions. Many were exposed for long periods to rain, snow and sunlight outside shops and businesses, and surviving examples are increasingly collected today as pieces of Japanese commercial and graphic-design history. This example is particularly attractive for collectors of Japanese advertising, Showa-era design, enamel signs, vintage shop displays and industrial memorabilia. Dimensions: Height: approx. 45 cm Width: approx. 51 cm Maximum depth/thickness including deformation: approx. 0.7 cm Weight: approx. 1.0 kg Material: Enamel-coated metal Display: Single-sided Condition: Used vintage condition with substantial age-related wear, including rust, scratches, stains, enamel loss, oxidation, bending and warping. Please carefully examine all photographs for the exact condition. The exact manufacturing date is unknown. As the manufacturing period cannot be verified, the item is described conservatively without assigning a specific year or decade. The sign will be carefully packed for international shipment. Japanese enamel sign, vintage Japanese sign, enamel advertising sign, Japanese advertising, Showa retro, Showa era sign, Japanese shop sign, vintage shop display, Japanese typography, Japanese commercial sign, old Japanese advertising, enamel metal sign, porcelain enamel sign, Japanese metal sign, retro advertising sign, vintage advertising, industrial decor, Japanese industrial decor, Japanese wall decor, antique shop sign, vintage enamel advertising, Japanese collectible, advertising memorabilia, retail advertising sign, Japanese graphic design, retro Japanese design, red enamel sign, yellow enamel sign, vintage Japan, Japanese advertising memorabilia ■ Please Note ■ Shipping Information: Items are shipped from Japan. As this involves international shipping, please be sure to check the shipping costs before placing a bid. Items are packed with great care to prevent damage during transit. Shipping costs are calculated based on the net weight of the item, packaging materials, and the weight of the shipping box. Depending on the situation, items will be shipped via DHL, FedEx, UPS, or Japan Post. Delivery typically takes 1 to 3 weeks. Import duties, taxes, and fees are not included in the item price or shipping cost. These charges are the buyer's responsibility. You may be contacted by phone or email by customs authorities in your country or the shipping carrier regarding customs clearance procedures. Please ensure you are available to answer the phone. If the carrier is unable to contact you, the package will be returned to us, and you will be charged double the shipping fee for re-shipment. We appreciate your understanding and cooperation.