There are many types of Post Box that you can buy.
The original Royal Mail boxes are now thought to be an ideal box for the home and an excellent investment in a genuine antique!!
Always buy from a reputable source and preferably from a Salvo Code member, therefore you can be sure of the authenticity of the item.
Yes even the humble post box is being made in bulk in China, this is totally illegal - but it is a very hard law to enforce, again check with your retailer that you are buying a genuine item.