177? halfpenny... variety? fake? other?

Picked this one up on eBay. Based on the seller's poor pictures it looked like
it might be an AU with an outside shot at UNC (U.S. grading standards).
Definitely not the latter, but I like the overall look. The date is funky though.
5/0? 0/5? Other?
Not exactly sure what this is.
Pics follow.


it might be an AU with an outside shot at UNC (U.S. grading standards).
Definitely not the latter, but I like the overall look. The date is funky though.
5/0? 0/5? Other?
Not exactly sure what this is.
Pics follow.


0
Comments
Somethin' goin' on there, for sure. I guess it's a 1770. (Edited to add: while I can see why you could perceive a "5" as part of the overdate, I think that's random coincidence, personally.)
Looks like there was also some repunching on the numeral "III" on the obverse.
Very nice piece, BTW. But I'd expect no less from you.