Bad, very bad

I had just a thought the other day about the qualifications of coins. I have lots of coins that are worst than Fine, actually some are Very Bad. Is it an idea to put two extra qualifications: B for bad and VB for Very Bad? This makes it easier when you have bad or very bad coins to be replaced by newly found better quality coins.

I believe you could use the personal comment for this purpose. Also, I believe (using our current scale) it would be G (Good) followed by P (Poor).