Unlike Kering, which has invested in reseller Vestiaire Collective and sells some of its labels on platforms for pre-owned wares, Hermes sees the second-hand market as a threat, saying it drives up prices and can fuel counterfeiting.
"It would be to the detriment of our regular client who comes to the store," Dumas told analysts following strong first-half results when asked if he had engaged with any re-seller.
Luxury brands have traditionally been wary of second hand dealers, but rising interest in pre-owned fashion from younger, environmentally-conscious shoppers has prompted some labels to reconsider their position.
Hermes is renowned in the industry for its careful management of production and stocks, which have helped maintain its aura of exclusivity.
It has output caps so that demand for its high-end handbags always exceeds supply. Its coveted $10,000 plus Birkin model generates waiting lists and can sometimes cost more on the resale market than in Hermes stores.
The group does not sell its prized handbags online.
"Demand has always been higher than our offer, we've been confronted with this for years," Dumas said, adding the group would not produce more if it meant compromising on quality.
The company has limited growth in its leather goods production 6% to 7% annually. It is currently building five new leather workshops in France due to come into use over the next five years.
"We produce with one thing in mind, quality, if we don't manage to have this in terms of know-how or beauty of materials, I prefer not to produce," even if this leads to bottlenecks, he said, adding that it takes 15 hours of labour to make a Birkin bag.
Larger rival LVMH has also said it does not intend to participate in the second hand market and has emphasized efforts to offer repair services for its products instead.
(editing by Silvia Aloisi and Elaine Hardcastle)
By Mimosa Spencer