There are 2 different 500 Guaranies 1997
1- KM#194 With the bushes Below the Central Bank Building (pm229)
2- KM#195 With the 500 Below the Central Bank Building (pm229.a)
The Full information is available in The wold Coin Catalog (Edition 2017)
the PM stays for the code of the Paraguay Catalog by Miguel Pratt
the information is available at http://www.portalguarani.com/detalles_museos_otras_obras.php?id=17&id_obras=1327&id_otras=219
Sorry no Swaps. Paraguay Post Office is to risky and they don't allow to send coins nor notes