I think you have to measure, or find data about this coil, than design a detector circuit to fit the coil. Seams an hard task to me.
As experiment who I am, i suggest you to play with the original circuit as a start point and maybe overcome the circuit flaws in the original design.
In my experience i saw that most of those cheap metal detector are sometimes "clones" of good design (obsolete), but for cost reasons they remove lots of components...
In my point of view they are lot of fun to deal with.
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