Sterling Silver chain necklace

Sterling silver chain 16 in bought from another seller but replaced w a longer 1 w a diff clasp closure. not posting as Tiffany brand just bc it doesn't really look like my other ones so idk if it's a dupe or just different? could def be real I just don't know how to tell for sure so selling for cheap& non-branded. def sterling silver tho (i don't have the pouch anymore btw)