"Hoping for more input as to the date." Me too--the high position on the last "8" is interesting.
I'm hardly an expert on these coins, but I probably have one of the larger collections of
Sweden overdates here on CCF. 
The sad truth is...with that degree of wear, you might never know what's happening to the date. Unless of course, we can find a match in a higher grade.
I don't think I have a match--but I'll look around. One thing that's really helped me when studying overdates...is to take shots from several lighting angles.
Below is a closeup of the date on a 1 Ore 1858/7 and 5 Ore--I'll look for my 2 Ore. All the 58/7 overdates I've seen show the left corner of the "7" poking out from the "8".
Often you will also see the 7's top stroke and the diagonal stroke underneath the "8". These are fairly common--and you'll probably find more if you search shows,
ebay, etc.



And sometimes, even with a clear enough date, it's not certain there's an overdate, repounched, or just a die chip. For example, the coin below has a rather straight bar inside the top loop of the 8. It might be an 8/7, but as no other parts of the "7" are visible, that's just a guess.
