* Add 1 Part 3004pb007 Blue Brick 1 x 2 with Lego Logo Closed O Style White with Black Outline Pattern (match ID 1)
* Change 1 Part Blue 3004p50 Brick 1 x 2 with Lego Logo Open O Style White with Black Outline Pattern {match ID 0 to 1}
* Add 1 Part 3004pb007 Blue Brick 1 x 2 with Lego Logo Closed O Style White with Black Outline Pattern (match ID 1)
* Change 1 Part Blue 3004p50 Brick 1 x 2 with Lego Logo Open O Style White with Black Outline Pattern {match ID 0 to 1}
The same AFOL mentioned about his set 310-3 that comes with the blue brick 1*2
with closed O Lego logo. This brick is currently not in any inventory.
I checked few used copies and saw both variants in different copies.