This particular bowl is 15 cm wide and 11 cm high. There are about 21 items in the collection.

Hello! 
I’m very glad that you chose Mearto for your online appraisal. 

Considering the photos, this item is:

A fine, well-made terracotta Pre-Columbian Mayan vessel in cylindrical vase form with bulbous bottom (15 cm wide and 11 cm high). The beautiful thin-walled vessel stands on a flat base. Banding black glyphs accentuate the neck and wide mouth with gently turned-out lip. Traces of other geometric figures or motifs are present on the body. Circa 600-1300 AD.

Beyond this description, I’m afraid I’m not able to provide further information, as there is no provenance statement or origins clear, as well as no guarantee that these pieces, if indeed authentic, were acquired according to all national and international laws related to the ownership of cultural property. In order to be sold, the international law also require an export license that the owner must take care of. Do you think it is possible to get any of this documents?

PROVENANCE: Inherited 
around $350 - 650 * 

*represents a fair-market value for auction purposes; retail or asking price may vary. 
Please let us know if you have additional items to appraise, and thank you again for using Mearto.

Thank you. I don't have export documents for these items, how do I get these documents? and I'm not sure about a provenance statement, you mean like a letter from my grandfather? thanks

Hello Catalina!
I'm afraid when it comes to ancient artifacts, the law is very strict. If you are in the US, U.S. Forest Service or Bureau of Land Management lands, there are heavy restrictions against collecting and removing artifacts. The Archaeological Resources Protection Act (1979) forbids any artifacts from being disturbed or removed. This is to prevent looting, robbery and the expansion of the black market.
A provenance of statement is often given by the authorities and the government of the country where it belongs the artifact and it's normally provided before purchasing the object in order to ensure where it comes from.

These are international items and have pictures of them in family possession prior to the 1979 laws. Is this sufficient provenance?

I'm afraid not. Here could be more information for you: https://www.nps.gov/subjects/archeology/laws-regulations-guidelines.htm

The laws quoted on the site apply to North American/US archeological artifacts. I see no mention of transactions/provenance of international artifacts.

I'm afraid this go beyond my area of expertise, as I am not expert on national or international laws.

Have a good day

Thank you