17th century in depictions in print (in black and white), the cross was sometimes shown. The modern design of flag and coat of arms with the cross in one corner dates to 1815. The precise definition of the proportions of the cross dates to 1963. Unterwalden The flag Unterwalden, as the canton itself, has a complicated history, on one hand due to the rivalry of the constituent half-cantons Obwalden and Nidwalden, and on the other because its historical flag was identical to that of Solothurn. The war flag of Obwalden was plain red and white, first recorded in 1309. Nidwalden tended to be dominated by Obwalden and usually fought under the same banner. A single key was used in the seal of Nidwalden from the mid 13th century. This seal was used for both Obwalden and Nidwalden (i.e. the united canton of Unterwalden) during the early 14th century. The addition et vallis superioris "and the upper valley" was scratched into the seal to reflect this. At this point, there was a seal (with the key) and a war flag (red-and-white), but no coat of arms. From ca. 1360, Obwalden and Nidwalden were separated into two independent territories, while keeping a single vote in the confederate diet. Because of the "and the upper valley" addition scratched into the seal, Nidwalden began using a new seal of its own, and the seal of Unterwalden, formerly the seal of Nidwalden, now was used by Obwalden. The seal of Nidwalden now showed St. Peter with his keys. Nidwalden began using the double-key as a design on its war flag from the early 15th century. The red-and-white flag of Unterwalden was now also the flag of Obwalden if both half-cantons were to be represented separately. This was the situation as the fashion of coats of arms was introduced in the late 15th century. The early Standesscheiben of the first decade of the 16th century show the double-key as the coat of arms and flag of Nidwalden, while Obwalden has the red-and-white design in both its flag and its coat of arms. During the 17th and 18th centuries, the coat of arms of the combined canton of Unterwalden came to be depicted as a superposition of the red-and-white flag of Obwalden and the double-key of Nidwalden. Only in the mid 18th century does the single-key symbol (taken from the 13th-century seal) appear occasionally in coats of