What would count as a true heavy cruiser beyond the treaty-era 10,000-ton type?
Short answerRoughly 17,500 to 20,000 tons, with Alaska closest to the role and the treaty system leaving an artificial gap below capital ships.
NotesDes Moines sits near the lower bound for a fuller heavy-cruiser type, which is placed at roughly 20,000 tons. Cruisers need speed, range, rapid-response capacity, personnel, and facilities for worldwide presence missions, while a battleship can concentrate more narrowly on protection and heavy firepower. The treaty system's jump from 10,000-ton cruisers to 35,000-ton capital ships therefore left a force-structure gap. The counterfactual ladder inserts 20,000-ton, 12-inch-gun armoured cruisers between ordinary cruisers and battleships. Alaska comes closest to this idea of a proper heavy cruiser. Deutschland is neither a coastal-defence ship nor a convincing example because of its protection, speed, and overall compromises. Classification here depends on mission, size, protection, and armament rather than an official label alone.