A pivot is a retacement from original price, in this case a lower low on 60 min. bar thats it, no 5 bar or 5 finger analogy exists, a pivot is a pivot.
But yes the 3620 pivot can be called a doubtful one because there was difference of mere 15 pts . between the low of 2 bars i.e 11 am and 12 am bars, a visually obvious pivot should have had atleast 30-35 pts. difference.
I say it again, dont confuse the pivots with 5 bar etc. kind of a method, even a 4 or 3 bar move can form a pivot