Interchangeable Sigma telephoto lens.  Filter size 72.  There is a sticky residue on the outside of it.  I'm not sure what it is. There is one place that the numbers are a little rubbed off as you can see in the pictures.  Made in Japan, comes with protective carrying case and original retail box.  Has both lens and base cap.  Check out the photos, let me know if you have any questions. 

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