We will soon present the 2.7-cm medallion with the original Bhagavad-gita from 1972 (in English). Each square is a page engraved on metal with micro laser. The photo is of the process being carried out by a company that works for NASA, a leading U.S. company. The materials and engraving are guaranteed in the lab for a duration of 10,000 years, so it is the first project to preserve Srila Prabhupada’s legacy with concrete and effective results. source: www.vedicvault.org