The information is in the auction catalog of these ABNC archives ( Christie's Robson Lowe N.Y - 28 Sep.1988).
Articles about this Auction and catalog were published in the Chile Filatelico magazine of Sociedad Filatelica de Chile (nr.246 Oct/Dec 1988 and nr.248 May/Aug 1989).
The images posted here were taken from those articles. That's why they look like they were printed.
I have personally seen the sheet/collage made with Chilean postage stamps (the ones in the previous post) and I can say that it's made with proofs cut out and pasted on the sheet.
These two sheets : Lot #402 (Chilean postage stamps) and Lot #418 (Chilean tax, telegraph and consular stamps) were obtained by a fellow of the Sociedad.
These ABNC archives sale included similar lots with material from Canada, USA, Mexico, El Salvador, Costa Rica, Ecuador, Brazil, Peru and Argentina.
Postage stamps, taxes, tobacco, medicine, telegraphs, banknote vignettes, etc. were used in these collages.
Sheet Lot #418
