My 4 inch 28-2 shipped 1974 and has original Magna (no diamond).
The Magna's do make it a bit of a handful under full load Maggie recoil so maybe a lot of LEO's changed to Packy's either Agency issue or their own buy. Hard to tell after all these years but from the above posts it appears that the SFPD had a heck of a lot of them.
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Charlie B
SWCA#3083, SWHF#570
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