Signed "LC Roff" Blown Glass Vase (Black and white)

I have come to find this vase in my collection and just love the deisgn. It is a black and white blown glass vase with a signature of " L C Roff". I am looking for more information on the artist and origin of the vase, and a value if possible. It is in MINT condition, no chips, cracks, nicks or any other type of imperfection. Thank you