Where should the missing hour hand point?

In a clock-series puzzle, each clock face has an hour hand and a minute hand pointing at two numbers on the dial (1 to 12). Reading the clocks in a fixed rotational order around the figure, the sum of the two numbers on each face typically changes by a constant step from one clock to the next. Once that constant step is confirmed from the clocks that are fully drawn, the same step gives the exact hand-sum the incomplete clock must reach, and whichever hand is missing is fixed by that target sum.

Reading the five clocks clockwise starting from the top-left one:

The hand-sum rises by exactly 1 at each of the three fully-drawn clocks before the incomplete one (14 → 15 → 16), so the incomplete clock's hand-sum must be 17. Its minute hand is already drawn pointing to 12, so the missing hour hand must point to 17 − 12 = 5.

Checking the last clock in the round confirms the pattern: its hand-sum is 7 + 11 = 18, exactly one more than 17. So the sequence 14, 15, 16, 17, 18 holds without a break all the way around, and 5 is the only hour-hand value that keeps it that way.

Hence, the missing hour hand should point to 5.