Okay - so in summary I appear to have purchased some sort of AVRI Frankenbass which is all very strange given that it's brand spanking new:
From the 64 AVRI: Sunburst pattern (brighter), nitro finish, tort guard, lower mounted tug bar, neck plate with the serial number stamp (no "F" stamp on neck plate)
From the 74 AVRI: 74 routing for bridge pickup, Single slot bridge barrels, U shape bound/block neck, Large TV logo, "Fender" stamped 70s tuners
Maybe Fender had a few odds and ends left of each AVRI before they switched over to making the new "American Original" series? Be interesting to get Fender to comment on this one.