I wonder if you a got a bad compass. All the MC-2 Globals I have seen have a good line down the mirror like the one below.

I am going to the local gear store tonight or tomorrow and I know they carry the MC-2 Globals. I'll have a look and will let you know as perhaps they have changed the product in the last while.

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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock