My default is to assume that any
Trade dollar not in reputable
TPG plastic is fake, and (not) bid accordingly, in other words, bid any money I don't care if I lose. If I see one for a hundred bucks and it looks real enough and is from a reputable seller, I might take a shot on it just as a gamble, because sometimes you do get lucky.
The reverse die crack is often diagnostic of a fake, but your coin has a Type 2 obverse & reverse, which is correct for 1877, and the detail on the front rocks and rear feathers is correctly detailed instead of flat.
Another dead giveaway: Look at the coin, facing up, just like in your first photo. Take it, and flip it over to the other side without rotating it. In a real Trade, the coin's reverse will be upside-down to you (coin alignment); in a fake Trade, the coin's reverse will be right side up to you (medal alignment.)
The fact that it's not magnetic is good, and the weight should be around 27g.
If you have a 27g, non magnetic, type 2/type 2 1877-S
Trade dollar with coin orientation, it's probably real; it looks plated, ex-Jewelry, probably ex-Orient. Either that or the Chinese have REALLY stepped up the game.
I am going to vote with the "real" camp even without your testing; but if you could weigh it, or tell us the orientation, that would be great.
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