It's simple guys-Alcatraz was released as a GLOW but when HL responded to the feeling by collectors that no light should be a GLOW before an LE was issued, it along with several other lighthouses, was changed to an LE. The LE was retired and then a new GLOW was issued as 417 in May 1998. You have a limited edition which started life as a GLOW. For any question about HL you might have, use the search function for a word such as Alcatraz, and the software will find the information for you.
Jim
Johnson