Note reverse @ 4:00 oclock, looks as if applied rim, much like applied rim to early cork type bottles. Also check out the reeded edge, whats up with this coin?
What you are seeing on the reverse at 4 o'clock is called finning. It happens when a coin is struck with greater than normal pressure, when the planchet is a bot thicker than normal,orwhen the dies are improperly spaced. What happens is that bit of metal is forced up between the collar and the die - creating that fin around the rim. As for reeding, that's a bit more puzzling. But it looks maybe the coin bounced inside the collar during the strike.
Not necessarily. Think about mechanical doubling, it's caused by a die bounce or a die shifting during the strike. And yet it typically occurs on a very small part of the coin, sometimes only 1 letter or 2. Same kind of thing could have happened here. I'm certainly no expert on the subject, but that would be my theory.
At 4 o clock , as GDJMSP said ; finned rim. Personally I find this to be very appealing when I pick out coins and I tend to buy coins with this effect present or die cracks, It's a sure way to make a coin unique and IMO adds eye appeal As for the rim , I think it's post mint damage that was deliberately created by a individual that had too much time on his hand, after which the piece was put back in circulation.
Interesting reeding done for sure. I have a 1953 same coin except for the reeded edge, actually mine has an incused edge with "Agricultura Industria Comercio" stamped on it. Maybe someone who has the same year will chime in on this subject with a pic of theirs. Nah, that reeded edge was minted on that coin. I just checked on ebay and 1950 has a reeded edge, here's the number 160401957585. Good learning experience tho. I thought the idea that someone would add a reeded edge to a $10 coin was a little far fetched. check the pic, it may be too small, check the number on ebay.