If those references don't give a mintage, then it's likely the mintage is unknown. Either the records have been lost, or the (surviving) records were kept in such a way as to be uncertain as to how many coins actually dated 1872 were made.
In 1879-1883, Peru fought a war against Chile, and lost; Lima was occupied and Peruvian government buildings pillaged by Chilean troops. I suspect things such as coin mintage records could well have been lost during this time.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis