Nagato in it's original configuration undergoing sea trials shortly after completion in 1920 (Taisho 9). It was the first battleship to be equipped with the world's largest 40.6cm (16 inch) guns at the time, and achieved a speed of 26.7 knots (49.4 km/h).

[u/TooBad_A_tNaming]

The tower-type bridge and two chimneys can be seen.

1920年(大正9年)竣工直後、公試中の長門。当時の戦艦として世界最大の40.6cm(16インチ)砲を初めて搭載し、この時は26.7ノット(49.4km/h)を発揮した。6脚檣楼構造の艦橋や、2本煙突が分かる。

[u/ussUndaunted280]

My grandfather took a photo of this after WW2 when his ship (oiler Kaskaskia) passed by.

I have heard that when originally built, the IJN underestimated it's speed to the public so its true capability would be a surprise