The fishhook clasp is generic and likely the mark is that of the maker of the clasp, not of the pearls.
I see French wire (that little coil) used to protect the thread where it meets the clasp; this is usually not done with imitation pearls, so likely you have genuine pearls.
A common test to see if they are genuine pearls or imitation: Rub them against the edge of your front tooth, or rub one pearl against another.
Real pearls feel gritty when rubbed this way, while imitation pearls glide smoothly (if they are clean; if grimy, there may be a bit of sticky resistance.)
If they feel gritty, likely they are cultured pearls.
If they are also completely round, likely they are akoyas.
If they are at all egg shaped, then likely they are freshwater pearls.
Pearls are best evaluated when photographed against a white background, and in focus. Also it helps if some of the photos are closeups (especially any pearls that have surface blemishes) and also at least one photo showing the entire necklace.
How long is the neckl