How old is my Edgar Allan Poe book?

I just came across an Edgar Allan Poe book called Weird Tales - It has W.B. Conkey Co. as the publisher, but I cannot find a date anywhere on the book. It looks VERY old with some sort of large symbol on the cover and the cover seems to be made of canvas material. There are a few short stories in it - The Murders in the Rue Morgue, The Mystery of Marie Roget, The Purloined Letter and The Gold Bug. Anyone have any idea how old it may be?