Here's what looks to me like a very old industrial CO2 laser. I worked with scientific CO2s at S-P in the early '80s, in the same space where they built these. The line was bought from GTE Sylvania, and the paint scheme of this unit looks to be from the time of that transition if I remember correctly. This laser's been offered on Ebay for about a year now, with no takers. I'd love to have it in my collection, but have learned a looooong time ago to not buy such large heavy dust collectors. A couple of SP-125s keep that lesson fresh. But still.....

http://www.ebay.com/itm/SPECTRA-PHYS...1#ht_500wt_717