100-400 USD
No published sn data I know of.
I can say that the Interarms Mark X viscount was imported from 1973-1983,and reintroduced in 1985 till 1996.The early models were made in England from parts manufactured by Zastava Arms in Yugoslavia.Later models were made in Yugoslavia by Zastava Arms company exclusively.
Mark Vargo was born on May 15, 1954, in Alexandria, Virginia, USA.
Mark Semos was born on October 6, 1978, in Alexandria, Virginia, USA.
although the interarms is a good rifle. the value is not very high (don't know why) I sold one about 8 years ago for $300 and it was like new..................
No published sn data I have seen.
Yes.
Take it to a gunsmith.
50-500 usd
Yes
10-500 usd