No se si te servirá pero sólo he encontrado los siguiente:
PIEDRA BELCOS, Braulio Christening
Gender: Male
Birth Date: 26 Mar 1858
Christening Date: 26 Mar 1858
Recorded in: Estella, Navarra, Spain
Collection: San Miguel; Catolica
Father: Santos PIEDRA
Father's Father: Pio PIEDRA
Father's Mother: Sencia DURAZ
Mother: Tomasa BELCOS
Mother's Father: Jose Maria BELCOS
Mother's Mother: Ramona SALINAS
Source: FHL Film 1230059 Dates: 1809 1905
Saludos
Rogelio Martínez de Azagra