Unfortunately, your picture quality is very poor and no determination could be made on authenticity from them.
The last feather is pointing in between the "I" and "C" in AMERICA, so that is one indication it is authentic. We will need much better pictures of both the obverse and reverse to be sure.
Im going with fake on the 1877 considering that is a very key date for the indian heads, the nose looks really funny on it.
No, the weight will be the same no matter if it's fake or not. We need pictures of the back. The "N" in One should be fairly weak especially around 5 o'clock. Also, closer pictures of the date is a must!
The 1877 does look wrong to me as well. The nose and forehead just don't look right to me either. I don't really collect these so it it for what is worth.
Hey I forgot what you name was, but you said you where a manager at a pawn shop right off 35, Do yall happen to sell coins there? lol