I have an old Topcor RE 13.5cm f/3.5 lens with a hard leather case for sale.  It was part of a collection of things my uncle left to me.  I believe these lenses were made in the early 60's.  In pricing them, I have seen prices ranging from $60 USD to $400 USD. 

The lens itself is in good condition with some signs of wear.  I would think of it as a collector piece rather than a working lens.The hard leather case is also in good condition with minimal signs of wear.

Let's say $75 USD plus shipping.