Need help identifying bottle age
I just bought a demijohn online from a reseller in the middle of France, it was about 30 euros.
I'm now in paris for a short while so i thought I could bring something small back home for terrarium making. This bottle is about 30 cm tall, 20 cm in diameter. I bought it mainly because it had an asymmetrical neck, but there are many reproductions these days so I'm not sure if it was an authentic mistake.
Would anyone like to do some detective work here for me please? I hope to know its rough year of production, the cost in the market (if I were to resell) and maybe any other guesstimations! Really appreciate it!