I have just listed on eBay what I believe to be a National brand
aluminum frame rotary box vacuum pump in unrestored condition.
I have listed it with a possibly wild price -- or maybe a low price
-- as I have no idea what it is worth.

I have also listed it as pickup only due to weight, but it could
be shipped.

If I get an offer outside of eBay, I can sell it outside the site.
Search for "National Piano aluminum rotary player piano vacuum pump"
and it should come up: https://www.ebay.com/itm/185866437779 

Gary Goldsmith
gary.goldsmith4855@gmail.com.geentroep [delete ".geentroep" to reply]

 [ It looks like an Autotypist pump. See
 [ https://www.mmdigest.com/Archives/Digests/201709/2017.09.28.02.html 
 [ -- Robbie