The VSD1 with the Numbering on the housing is the VSD1 Limited Edition. It was actually announced in August and was on pre-order only in China with 999 units made. It was supposed to come on 15th of September but Came out October 1st. As far as I know it's using the same drivers as VSD1 and VSD1S but with increased impedance (80ohm) and different tuning. According to Vsonic's CEO it's tuned like the VSD7 and a good way to demo the VSD7's sound signature. I couldn't order a pair initially coz it was supposed to be sold only in China to previous vsonic customers and one 1 pair per person but it seems that during the 2-day pre-order period not all of the units were sold and that's how they are available at certain retailers now.
As far as i know, driver is quite different from VSD1, you can compare specs form GR07 and VSD1 SE, and see that they are identical, except impedance. In fact, VSD1 driver is rated as dynamic driver, and VSD1 Driver is rated as High Dynamic Driver (like GR07). In a two days i'll receive my unit, and will check.
VSD1 Special Edition
Driver: 11mm High Dynamic CCAW Driver
Impedancia: 80 Ohm +/- 10%
Sensibilidad: >105 db (a 500hz)
Rango de frecuencia: 7 - 30,000Hz
Distorsión: < 0.2% 105dB
Balance de canal: <1dB (a 500hz) <1.5dB (a 20hz-12.5 Khz)
Potencia min. 10 mW
Potencia max. 50mW
Conector: 3,5mm chapado en oro de 24 kilates
Cable: TPU de cobre de 1.30m de longitud
GR07
Driver: 11mm High Dynamic CCAW Drive Units
Impedancia 50Ω+/-10%
Sensiblidad≥105dB (at500Hz)
Rango de Frequencia 7Hz—30,000Hz
Distorsion≤0.2% 105dB (20μpa)
Balacne de Canal≤1dB (at500Hz) ≤1.5dB(at 20Hz~12.5Hz)
Potencia min.10mW
Potencia max.50m
Conector: size3.5mm 8μ’24K gold plated dual-channel
Cable: 1.30m TPU cable, 82 core 99.9999