Yes, 380 means 380.000 yen.
Depends on which year it was produced, what kind of specs it will have. A 200-2005ish 380 will be a current 480 I believe.
A 5 digit serial number will most likely be earlier than that though.
Do you have any pics?
Best comparative would be a LS320 Tokai although Tokai has brazilian rosewwod vs honduras rosewwod (which would be inbetween brazilian and indian and a nice choice- and clearer colour-I have it as a fretboard in one NST-320R).