I think you are confusing poorly made with lower density knotting and different technique of weaving. Bijars are known as steel carpets of Iran because they are very densely woven and very hard wearing. There are Bijar Garus, which are well woven but not as densely but have a lot more character.

https://sharafiandco.com...ge-bijar-rug-162x107cm/

This is an average density of a densely woven variety and you can take it from there.

Please note that density is only one aspect of the quality of a piece but there are many more factors, like wool, dyes, design,etc.

One of the main features of some Bijars is the fact that they use heavy beaters and they do beat them hard to achieve the famous density that they have. Don't forget that the denser the carpet the heavier it is.

Thanks, I gave up collecting, as ran out of space...but...got rid of a couple old lesser quality to have some fun hunting again!! Thank you and all the others for the help over the years!