Nice early Chief. In fact, it seems to be an example of a "Baby Chief", ...check the smaller, rounder trigger gaurd. Is the ramp sight smooth, or serrated? There are three variations of front sights. Yes, it should have diamond grips, but this early a model may also take grips about 1/8" shorter than the later ones. Hondo44 or one of the other gurus will be along shortly with much more expert info than mine. And generally, early examples, particularly the Baby Chiefs, will be worth more, sometimes significantly more, given similar condition.

Nice looking gun.

Best Regards, Les

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SWCA 3084, SWHF 495, PGCA 3064