Noun
にほんせい
その日本製の刀の柄には、美しい宝石が散りばめられている。
The sword hilt was made in Japan and is studded with beautiful jewels.
Things that are manufactured in Japan (日本) are made in Japan. Good quality stuff, that is.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Will help if you know how to read 日本 already.