A wonderful piece of history- I think this is a pressure and vacuum pump- but not 100 percent sure-  it has two oilers on top- one appears auxiliary and the second to lubricate the pumps.  Athur Thomas precedes Thomas Scientific.  You will likely never find another opportunity to buy this pump!  It's awesome in my opinion.  Great to tie to a steam engine for nostalgic demonstration- or whatever other creative ideas you might have?  Free US shipping is by my choice of USPS or fed Ex as the carrier.

Sold with all the grome it came to me with.  Certainly incandescent be cleaned up nicely with effort.