Dupont and Duvain are two different brands, but they have some similarities in some aspects.

S.T.Dupont is a French luxury brand that mainly produces high-end leather goods and accessories, such as lighters, pens, wallets, etc. Dupont's products are known for their exquisite craftsmanship and unique designs, and their prices are relatively high.

Doppler is a Chinese brand that mainly produces lighters and pens imitating Dupont designs. Duvain's products imitate Dupont's designs in appearance, but the prices are relatively lower.

In general, Dupont and Duvain are two different brands. Although they are similar in some aspects, they are obviously different in terms of brand history, product quality and price. difference.