1492: Erdapfel Globe (the oldest) by Martin Behaim

The Erdapfel is a terrestrial globe produced by Martin Behaim from 1490–1492. The Erdapfel is the oldest surviving terrestrial globe.

The Americas are not included, as Columbus returned to Spain no sooner than March 1493. The globe shows an enlarged Eurasian continent and an empty ocean between Europe and Asia.

Here is a little problem I have with this globe.

• From its creation until early in the 16th century, it stood in a reception room in the Nuremberg town hall. After that time, it was held by the Behaim family. In 1907, it was transferred to the Germanic Museum in Nuremberg.

KD: this globe, allegedly made in 1492 (conveniently leaving room for the Americas) resurfaces in 1907; 500 years after it’s creation.

• Narrative can say now that in 15th century the shape of the Earth was already known.

My question is a fairly simple one - how do we know that this Erdapfel was not made in 1906?