It is without the battery cavity (and the mono/stereo switch). As far as I understand it that excludes all later models. A neck change makes sense.

Just got a NFV1 (I sold my NFV5 in 2012 and has regretted ever since). Mint condition. I wonder about the serial though it is 600030 USA. That indicates that it was produced in 2000 as far as I understand. But NFV1 was not produced in 2000. Anyone who can shed a light on that?