When buying counterstamps, it's best to avoid the ones in which individual letter punches were used. The prepared, logo punches are generally too costly an item for a trickster. Then too, an antique logo punch is sometimes used on a coin. These can be tricky. In my travels, I've seen but a few. There are pics of most classic counterstamps, so comparison can be made if one has the books or online resources. Sadly, the VOTE THE LAND FREE and the OIL OF ICE counterstamps have been faked, but these are discernable by comparing the style of the punches usrd.
While it's possible that Paul was correct in his assumption about the piece he posted, it's one that I wouldn't buy for a buck. Yet, if it drives one's imagination, like a replica coin, many will buy them. Confirmed logo punches, like the one on my avatar, typically sell in the hundreds. Bonafide history offers the best value. Let the buyer beware ... as with the fake and altered coins.