The Police were not always first in line for luger parts. Looking at the data on Jan Stills Forum it appears the Police were scrounging for barrels around the time your gun, 5210x, was produced.
My 1940 Police banner, 4748x, has a Su (Simson) stamp on the barrel.
Yours received a Mauser S/42 replacement when produced.
In addition the following barrel markings have been recorded in that time range.
4122x S/42
4347x S/42
4569x Su
4995x Su
5679x S/42
5755x S/42
6128x S/42
I believe your gun is original and correct.
Tom
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