I would have said gXf with surface concerns personally. would need to see them in hand t confirm that they are problem free
Definately better than VF, both coins are really nice. I would say EF+ The 1910 close to aUNC but would need a closer look with a loupe.
Nice coins - Love the way they have aged. From the photos ! 1910 - Strength in the star, emu feathers, grass and "ADVANCE AUSTRALIA" indicate much better than the 1912. Obverse shows a hint of pearls 7 & 8 (in the photo). 1912 - its a nice VF+ from the photos and a bit of a problem with the rim at 10-11 o'clock reverse. Thanks for posting the pics.
Agree with above: 1910 - aUNC potentially UNC (needs a good looking over) 1912 - gVF maybe even XF - needs some high power checking on the high-points wear
Both could go anywhere from aEF to UNC but too hard to tell from the photos but threepences are notorious for being weakly struck
Both look well struck to me with Excellent details (near complete on both). Concerns are uneven toning and rim carnage (both me be more or less severe in person).. i may have undergraded by a grade (which id rather - dont like to pump up expectations as a coin shop will grade very harshly.. the more reputable the more conservative i have found).. 1910s are not uncommon in this grade .. i have 3+