Depending upon the chambering, it appears to be either a #1S, or a #1H.
AFAIK, Those are the only two red pad 1970's-80's models with both the AH forend & open/iron sights - and also, it doesn't appear to be an early model.
The #1B has a longer, full/beavertail, forend and no sights (IIRC).
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