Korean era mine detector

Someone has a complete (in the box with manuals) Korean war era mine detector for sale in the local trader publication.
I don't have any use for it but if someone is seriously interested I'll check it out.
They are asking $300.00 OBO.
I might lowball them and flip it to put some cash in the 5 ton restoration fund.
Any ideas as to what it's worth?

is it north or south korean, the north just marched privets across the mine field to clear a path, so the next question is, is it used, im not sure id want a used north korean mine detector