Without any further details, the minimum it would be worth
is approximately twice the value of a "Pre-Sample'. The last Pre-Sample I know of sold for $7500 back in November. This one should be worth around $15,000, give or take. If it is an original Dutch manufactured MG and amnesty registered it should bring $20,000. If it is a newly manufactured receiver gun registered in the 80's it should bring $15,000.