Treaty-power Spain changes both world-war coalition calculations

Given the earlier Spanish naval policy, would Spain gain a Washington Naval Treaty seat?

Yes, if it sustained that fleet through World War I; its treaty status would then make Spanish alignment a major part of British, French, and Italian planning before World War II.

Spain reaches the Washington conference only if it preserves the construction rate, industrial status, and fleet strength imagined earlier through the First World War. A navy of that scale would make Spain attractive to both coalitions, with Allied alignment presented as the sensible wartime choice. The later political path matters even more: a fascist Spain aligned with Italy would force Britain and France to count another treaty fleet in the Mediterranean and make pauses in construction harder to justify. Expanded treaty ceilings could also give the Royal Navy enough tonnage for roughly ten 27,000-ton carriers, changing its interwar aviation choices. Spanish strategy might still favor the Allies despite domestic politics. Naval strength magnifies the consequences of diplomatic alignment long after the ships are authorized.