I unequipped all gears even CE's and Shadow Gears. Here you can see the screenshot of no Toy Ring equipped.
Look at the bonus stats and attack. Str +15/Agi +17/Vit +7/Atk +0.
Then this screenshot below is with Toy Ring equipped.
Look at the stats bonus of Str/Agi/Vit and atk. It just give +10 Str/Agi/Vit and 50 atk at Sword Mastery lvl 10.
Then complete bonus should be +5 Str/Agi/Vit plus the +10 Str/Agi/Vit +100 atk at lvl 10 sword mastery/training.
The total bonus should be +15 Str/Agi/Vit and 100atk.