The German Eagle insignia will add collector value.
Very often the markings on a gun contribute to value. Like having a Swastika or the Chrysanthemum on the Japanese rifles. On most Japanese rifles the Chrysanthemum was ground off after the war.
Quote from Wikipedia:
The Imperial Ownership Seal, a 16-petal chrysanthemum known as the Chrysanthemum Flower Seal (菊花紋章 Kikkamonshō or Kikukamonshō) stamped upon the top of the receiver in all official Imperial-issue
rifles, has often been defaced by filing, grinding, or stamping on surviving examples. There are conflicting claims that this was done on the orders of the Imperial Japanese Military prior to surrender, or by U.S. occupation personnel prior to approving a U.S. soldier's permit to take home a rifle as a souvenir. No documentation from either Japanese or U.S. forces has been found that required the defacing. Most of the Arisakas with surviving insignias are in Japan, though there are a few remaining on samples taken as war trophies before the surrender, and those captured by Chinese forces.
As an example a pick of one of my Arisaka's from Nagoya Arsenal;