What this source establishes
The date of the blessing — on parish and diocesan record, which is one witness family, not two.
This is as much of it as we may lawfully print. The rest is at tuticorindiocese.org.
1855
Templum sit duplex, ara sed una
Fr Grégoire got the plan accepted in 1854, and it was not easily done. On 9 August 1855 the bishop came and blessed the foundation stone of the church that stands today. One of the priests made a motto for the design, and it is the whole building in four words: “Templum sit duplex, ara sed una.” Let the temple be twofold, but the altar one — and that one altar for all. Two naves would open apart at their doors and lean toward each other down their length until they met, and where they met there would be one sanctuary and one altar, for everyone who came in at either door.
DocumentedThis moment rests on 4 sources.