I just checked the website of Matt and all three pictured rifles have the standard safety. See yourself here: https://www.wwiigermansniper.com/objective-mount-double-claw
Farb, thanks for telling me the dot barrel is OK. Would the rifle originally had the single rune on the receiver, or not? And was this one straight converted after having been made due to lack of a SSZZA4 proof?
As Mike pointed out, your rifle should not have the SSZZA4 stamp because it never went to that depot. And yes your safety is correct. I am yet to see a double claw with a shortened safety.