I recently purchased some discontinued thread, second hand from a nice lady and I need help figuring out exactly what weight it is, so I know how to use it appropriately. It's Madeira thread and it says "Madeira Tanne No. 30 5000 m Nm 50/2" and inside the spool is a color lot #. So....do I have 30 wt. thread or 50 wt. thread? I typically use 50/2 weight thread for piecing so I've compared my Mettler 50/2 to this thread and this Tanne thread maybe seems a little heavier. But, it could be an optical illusion. Anyone use this thread in the past and can maybe fill me in on what weight it really is? I think I'll use it just for quilting the tops and not piecing, but haven't found much on the net. Thanks.