1964 Fender Jaguar Jazzmaster ( maybe) Need help identifying. Servicemen Guitar

Description

1964 Fender Jaguar Jazzmaster. I am not sure what I have here. I can tell that the body has been refinished. Looks like it was originally Sunburst (see pics). I have looked everywhere for a serial number. I can only locate 77 N. I have no clue what that means. The Tremolo system has a pat # 062570. Hope someone can help me identify this guitar. I am not going to attempt to clean. Will ship as is. I just took the strings of today so I could take it apart to locate serial number. The pots/knobs say Noble 500k made in Japan. Any help? There is one screw missing on the pick guard. Someone has placed a socket under the bridge. Comes with hardshell case and vintage strap. Please let me know what I have. Thx