https://www.realgunreviews.com/sig-sauer-proof-marks-date-codes/Debated posting in here or starting a new thread, decided this would be better. I have my name on a list for a West Germany marked P228. I am trying to figure out what the proof mark next to the serial number on the frame is. I only have potato quality photos since they were posted by the dealer and no image of the chin. I just can’t make out the mark. Thoughts?
That's a "Nitro" Definitive Proof Mark from Ulm to the right of the SN.
Here's some additional marks.