Vintage cognacs are rare nowadays. Due to French customs laws and to ensure the cognac released is entirely of the stated vintage, spirit destined to be bottled as such has to be kept behind a locked door with 2 keys - customs have one and the distillery the other. This example is from 1935, a time when things were no doubt easier.
Please note that this is an old bottle and the closure may have deteriorated; care should be taken when opening the bottle. As such, the item is sold as described.