Goetz & Sturgess place the change to all blue parts in 1937 at "around the t suffix block". That leaves it open to the possibility that some late s suffix block Lugers may have been all blue.
Only an in-person examination - or much better pictures - of your Luger can answer whether yours originally had straw small parts or not. I can't determine if your serial number begins with an 8 or a 3.
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