Modified the catalog for https://en.numista.com/catalogue/pieces48305.html.
The note in the comments section referred to a vague, unverifiable, and misleading coinage quantity.
These are the front and back images of a COA in my possession for the 50th Anniversary of the Numismatic Society of Peru:


This COA proves that, at a minimum, 668 of these coins had been pressed.
This metered coinage number is congruous with Page 23 of MONEDAS CONMEMORATIVAS at http://www.bcrp.gob.pe/docs/Billetes-Monedas/Cono-Monetario/Monedas-Conmemorativas.pdf which lists the maximum coinage at exactly 1,000 pieces.
The quantity of 668 is not very different from the maximum quantity of 1,000, so that we may dispense with "...the actual amount minted was much lower" language in the comments section.
Indeed, the Banco Central de Reserva del Perú still sells the coin online, and, 18 years after the first of the coin was pressed, the Lima mint appears to have every intention of reaching the maximum mintage:
https://tiendavirtual.bcrp.gob.pe/tiendabcrp/monedas-conmemorativas/140-quincuagesimo-aniversario-de-la-sociedad-numismatica-del-peru.html
Additional pressings of this coin are now available from the mint through national wholesalers. My COA's and coins were shipped from axcitos78 in Peru August 30th and arrived October 4th.
Previously, I had reported on August 30th that the coin was temporarily back ordered (e.g. additional pressings of the coin might be forthcoming):
https://web.archive.org/web/20190830153537/https://tiendavirtual.bcrp.gob.pe/tiendabcrp/monedas-conmemorativas/140-quincuagesimo-aniversario-de-la-sociedad-numismatica-del-peru.html
I did not have these COA's in my possession to refute the 350 coinage number that mysteriously appeared in the specification sheet when I checked on August 30th.
Now I do.
I have deleted the misleading comment.
Attentively,