Dime Printed In Reverse

What type of planchet is this on? It looks like a Zinc one with the devices on LIBERTY? But with the image reversed and recessed I believe this to be from another coin squeezed in a vise to make an impression the on the second coin. If it were struck from the mint, the die would have struck the image correctly in normal pattern. But this is what you would see from a squeezed coin. A garage job. Not a mint error.

I strongly suspect that this coin was altered outside the Mint. The dark obverse would indicate a foreign material was placed on top of the normal obverse or over an obverse that had been removed earlier. It could be a thin layer of lead or Wood's Metal. Then a normal dime was pressed into the soft metal, leaving an incuse, mirror-image impression. The lumps that are scattered over the surface are also something you wouldn't expect in a genuine flipover, in-collar, first-strike brockage. That's an error I've never come across, although it's theoretically possible. The absence of finning on the reverse rim is another indicator of fakery. How much does it weigh?

Looks like some one used it as screwdriver?