On March 31, 2019 I went to the Saguaro NP. I got this stamp for the Juan Bautista de Anza Historic Trail. The trail goes through the park.
In some other parks you can get the Juan Bautista de Anza NHT stamp
Arizona
Casa Grande Ruins
Saguaro NP
Tumacacori
California
Channel Islands
Golden Gate
John Muir
Santa Monica Mountains
https://www.nps.gov/juba/index.htm