Georg
Unfortunately there are no marks on the cover, the spine or anywhere that shows when and/or who printed this.

Hello, 15 prints?

Yes, not 20 as depicted on the front. This portfolio was found “as is” and the seller had no idea of its provenance. I will add some pictures of the cover. As you can see it was printed on thin, glossy card stock. I have looked at each piece thoroughly: Underneath, on the back...but cannot find any identifying marks.

The photos are now uploaded.

Georg
I assume you’re still working on this appraisal. What is the ETA.

Dear Jeffrey,

Thank you for the additional information. This portfolio contains reprints after paintings by the famous Ecuadorian artist Oswaldo Guayasamin. Probably the prints are made in an offset-print procedure which is used for print products with a high run like magazines poster or similar objects. The portfolio includes nowadays 15 prints, so 5 are missing. There is no publisher named and the prints are not signed or in another way directly related to the artist Oswaldo Guayasamin. Such portfolios are made by publishing companies and it is in no good condition. An estimate would be under 10 USD.
This estimation is based on actual recent past recorded auction sales of comparables. Retail "asking prices" can be higher and vary.

Kind regards,
Georg