Ever since I found a 1906 2 Ore with a prominent "flag" on the 6 in the date, I have been studying these details for evidence of the 1906/5 overdate. First, here is the complete date with areas of relief noted: The "flag" is quite distinct and is partially at the same relief as the 6. The secondary feature below is lighter but quite distinct under certain lighting angles—more so than the pic. By doing a tracing of a 5 from a 1905 2 Ore and overlaying the date, I see a close correlation between the overlay and the details outside the 6: Here's another view from my QX5--very useful to study a coin from several angles. This capture better shows the high relief of the "flag". I think my analysis is further supported by this confirmed 1861/57 5 Ore, which shows similar details projecting from the 6:
