Conchologist - a collector and student of mollusc shells.
a mug collector
The phrase "She sells seashells by the seashore" is believed to have originated from the life of Mary Anning, a fossil collector and paleontologist from the 19th century who sold seashells and fossils by the seaside in England. The tongue-twister may have been inspired by her work along the Jurassic Coast.
A bibliophile is a book collector.
It is obvious! the name is a thing you call shoe collector!
shoe collector or collector
The possessive form of "seashells" is "seashells'."
Military memorabilia collector, militaria collector, historical reenactor are a few that can be used.
a watch collector. there is no specified name.
Can a debt collector call a place of employment and demand to speak with the debtor?
That would be seashells.
sad
An Aquarist or Ichthyologist.