How old is this Charcoal Clay / Terracotta Stove Pot?

Purchased this recently for a low price, its in good condition apart from having been used with candles so needs a little TLC

Does it have any age? Its hand spun judging by the very noticeable rippling, also in not sure if its a set, as there is slight colour variations between the stove and the pot

 

These are a traditional style of cooking pot from Thailand, and are still being made -

https://www.templeofthai.com/cookware/thai-clay-hot-pot-6222000448.php

 

Thanks