That's a nice piece, but the name engraved on the left side devalues it.
The 1920 denotes Weimer acceptance-never saw one like that, but I'm no expert.
Assuming the numbers match, the holster is a plus as is the Nazi pin.
It is a Spange, worn to denote an iron cross 2nd class was awarded 1st world war.
Vets often did that.
$500 range for outfit not out of line.