Both stamps shown date to the 1930's. I haven't tracked Burke's photo stock used vs when the prints were produced, so no comments on the specific print date based on the stock used, but both appear to be of the type he commonly used. Neither was produced by George Brace after Burke's passing.
With photos like these, "Type 1" classification is not so clear-cut as looking up specific dates that a stamp was used vs. when the photo was shot. This would be a case where "approximately" would necessarily be used in the Type assessment. Both photos shown previously in this thread are "original Burke photos" produced by him during his working days. Use your best judgement and go from there.
None of what I have said should be taken as an analysis of the signature, which I will leave to others more knowledgeable about such things.
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