Hi I'm not to familiar with these types of things just coins but is this a keeper the serial number (ML 26600266 J)
No It's not a Radar, Repeater nor any other Fancy Serial number. This is what you are looking for - http://www.coolserialnumbers.com/FancySerialNumbers.aspx But.. The website doesn't mention a Bookend Serial number.. You have - 266 00 266 Imagine the 266 as bookends on a shelf. Kind of silly but it's really nothing major and no premium for that type of serial #