I have a 4 digit centenial I bought used about 1965. It has a flat latch. I guess I am as dumb as people say because in all the years I have had the gun I never noticed the white dot at the top of the safety. I didn't know about pinning the block out of the way when I bought the gun so I just took the piece out of the gun. The safety lever works like it is supposed to but the inside block is missing. Thanks for the article. Larry
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