

2 or 5. If I had to guess, it would be 2
1: no 2: Possibly 3: no 4: no - no examples, but I don’t think any format would have the 2 dots at the bottom left corner 5: Possibly - no examples though 6: no 7: No 8: no 9: No - no examples, but same reason as 4
If it were a 2, I think the left side of the 2 may have been cut off
Very crude markup: