To clarify to Stylites;
The sign outside the church and that can be seen from the road says"Roman Catholic Church’" It bears the name of a well known saint.
Then there is like an explanation,less noticeable,which I had not seen as I entered it(but upon leaving) describing it as an "independent Church’
Though this may be new to you, such places have been in existence for a long time, basically since the 1970s. In the archdiocese in which I formerly lived, there were four different chapels (one SSPX, others independent) that were not a part of the archdiocese. The deception involved is therefore not new. As dioceses become aware of the existence of such chapels, they generally issue public statements that clearly state that these venues are not authentic Roman Catholic parishes, but obviously someone new to an area may not be aware of this. As *Summorum Pontificum *and now
Universae Ecclesiae expand the number of EF Masses, this may become even more of an issue in some places.
The following advice is
not foolproof, but applies in most situations…As a practical rule of thumb , when a parish or chapel has been established by a diocese, it is not a tiny building that looks like it was converted from some commercial use. It is usually a more sizable edifice, even if it is still small compared to larger parishes, and most will in their bulletins make it clear that they are part of the local diocese. Another clue is a picture, not only of the Holy Father, but of the local bishop, near the entrance of the Church. (I realize that not all churches place these there, but many do, and the absence of such pictures, while not itself an indicator, should cause someone to ask questions BEFORE availing themselves of the sacraments.) If the chapel is an apostolate of the FSSP or ICRSS, the bulletin will clearly state that, usually with a statement that it is part of the diocese. Unless the chapel is part of such an apostolate–and therefore all sacraments will be in the old form–it is more likely (not definite, but more likely) that it will share facilities with an OF parish or apostolate. In that situation, not all Masses would be EF, another clue.
The best advice is to inquire on a diocesan website or call the chancery before going. Unless you know the apostolate is an FSSP or ICRSS one, there is a good chance that it may not be part of the diocese.