Peter,
I do not know how far along you are with these coins, the non gold
cup shaped coins were created in the Alexius coin reform of 1092,
Trachy, plural trachea.
Th first official coins created from 1092 to 1203 are the easiest of the series, they tend to be much easier to attribute because they were clearly struck.
We also have some confusion with other issues, some books will call them
Bulgarian imitations, they tend to be cruder and the jury is out on them being imitation or
military issues.
The post 1203 coins get more confusing, they are poorly struck and lighter in
weight. They are the most challenging, we have several on the board who specialize in the post 1203 coinage, I have admiration for these collectors because they can see what I cannot.
In the meantime if you have more questions feel free , I am sure you will get prompt answers.
Here is a nice
Alexius III rd coin minted 1195-1203 with a nice green
patina,
And an Andronicus minted 1183 to 1185.