I understand your frustration. I too have noticed that some thread manufacturers don't print the wt or ply on the spool. Drives me bananas!! Why do they think this information is optional?
Can't offhand remember which company did this ... ran into one just this weekend. It *might* have been a Mettler Serger thread - I liked the varigation but couldn't find the data, and the spool was wrapped in plastic so I couldn't finger it to feel the aprox wt or count the ply.
I've run into others on occasion as well.
So ... I stick to the companies that print the data on the spool.
Gutterman ... bless them, prints it on the actual spool, not just the end wrapper.
And while we are on the subject, why do some companies that do have all this data, find it necessary to place this data smack dab in the middle of the end wrapper where it's going to be torn when you put it on a spool??