The Legend of Zelda: Spirit Tracks/Stamp Stands

When Link returns home to Outset/Aboda Village after the first Temple, Niko has a favour to ask of him. In his youth, when he travelled the land, he saw little stamp stands scattered throughout Hyrule. Back then, he had nowhere to put the stamps. Now, he has a little stamp book. He gives this to Link, asking him to find as many stamps as he can, and put them in this book. There are 20 stamps scattered throughout the four Lands. Niko will reward Link with prizes when he shows him 10, 15 or all 20 stamps.

Outset/Aboda Village
The easiest of the 20 stamps to find, this is located to the left of Alfonzo's house.

Snowfall Sanctuary
As you climb towards Steem's hall, you'll see a thin, high staircase. Climb it to find the Stamp Stand.

Rewards
There are three rewards that Link will receive from Niko when he shows him 10, 15 or 20 stamps.

10 Stamps - Ancient Shield/Shield of Antiquity
If Link shows Niko 10 stamps, he'll be rewarded with the Ancient Shield/Shield of Antiquity. This shield is identical to the one used in Phantom Hourglass. It cannot be eaten by Like Likes. When Niko sees Link with his soldier's uniform and this Shield, he'll say that he looks just like 'an old, dear friend'. If Link already has a shield, that will be left in Niko's house, and Link can switch shields there between the normal shield and the Ancient Shield/Shield of Antiquity.

15 Stamps - Engineer's Clothes
For collecting 15 stamps, Niko will allow Link to wear his engineer's clothes from the beginning of the game. Niko thinks that these suit Link better than the Recruit's Uniform. If Link talks to Niko, he can change his clothes.

20 Stamps - Great Spin Attack
When Link finds all 20 stamps, Niko will give him the Great Spin Attack. This is a highly powerful version of the ordinary Spin Attack, that is performed by doing three Spin Attacks in quick succession, but leaves Link dizzy after. After seeing all 20 stamps, Niko has no regrets left in this world, and is deeply grateful to Link.