thanks for the additional pic.
as you and I suspected, you have an NS-2A.
by it's serial number it was made near the end of
the Spector/Kramer era, approx. 1990. the serial number
indicates this, and that is was made for Kramer at the Samick
Korean factory.
Kramer used at least three diff factories for the NS-2A/NS-2B/NS-2C
(most produced was the NS-2A) models in the late 1980s, right up until
Kramer went out of business. no matter which factory, an NS-2A is an
NS-2A
I hope this info helps.
PJ