Adrian SS,
Hi there, like all others have told you that is and OLD unit. If it were dirt cheap say $20 you could but it and try. If they want more as over $50 I'd check out a Whites 6000D coinmaster that was IN GOOD CONDITION and buy it. I had/have a 6000D and I pulled a lot of silver out of the ground as well as my first gold ring and some silver rings and a gold crown and ....... it's a good machine and USES double A batteries. You can get a hip mount for it or you might even find a 6000D hipmount unit on ebay or some other site as whites made the hip/chest mount units. And the 6000D manual is still available on the whites manual section of their web site.
Good Luck, 63bkpkr