CREATE TABLE table_204_430 (id DECIMAL, "model" TEXT, "origin" TEXT, "type" TEXT, "version" TEXT, "in service" TEXT, "notes" TEXT)

name a model that has the most versions .
SELECT "model" FROM table_204_430 ORDER BY "version" DESC LIMIT 1
SELECT "model" FROM "table_204_430" ORDER BY "version" DESC NULLS LAST LIMIT 1