Really nice 10x beam expander in hard wood maple? box. 

Someone took great care of this beam expander and it looks brand new. 

Has a C mount threaded end, 1" x 32 TPI. you will need an adapter for that as I only have one. 

A 1mm dia. beam results in a 1cm dia. beam as you can see in the photos, at 20 feet I was able to enlarge it to about 1" dia. and down to a perfect collimated beam and beyond by turning the focus ring.

According to my 1999 catalog this was $775

That would be much more today.