Tell me what this is please?

[Sparxter]

I recently acquired an old camera case with an old beat up leica, and some accessories. I've searched the inter webs and found a macro focusing adapter that looks similar but not the same. I'm guessing its focusing screans for 35 or/or 90 mm lenses. Am I right?

https://www.dropbox.com/s/xuv8f3g7x374ykv/Photo Jul 15, 7 46 05 AM.jpg

 

[rbiemer]

Maybe this will help?
See here: http://www.butkus.org/chinon/leica/leica_close-up/leica_close-up.htm

Rob