Mnemosyne notebooks have some of the smoothest paper and their grid notebook is great for either landscape or portrait orientation. There's a title space that runs along the inner margin with a 5 1/8" x 8 1/4" area of grids on the front of each sheet while the back of the sheet is blank. Each sheet is micro-perforated for clean removal.
Measures 6 1/4" wide x 8 1/4" tall, 140 pages. Perforated white 80 gsm paper, 5mm grids, slightly rounded corners. Wire-o bound, black plastic front cover, thick chipboard back cover. Made in Japan.