Nicely solved
Also BerTheir en bas (downstairs)

now BerTheir sur Mer.
BerTheir-sur-Mer was named after Alexandre BerTheir, a captain in the Carignan-Salières Regiment, who was given title to this area in 1672, then known as the seigneury of BerTheir-en-bas.
During the 19th century, Irish immigrants were quarantined at nearby Grosse Isle, now a National Historic site.
Richard Frajola (Pre 1839 early Pmks)
Early postmarks
Initially (that is, late eighteenth century), only Quebec, Montreal, and BerTheir had postmarks, mostly straightlines. One-offs, such as double oval and horseshoe types were put in use briefly. However, parallel to what happened in n s & n b, double circles were issued starting 1829; initially, the lettering was italic, but these were prone to damage, and subsequent hammers were more robust, with seriffed lettering