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Welding rebar

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I'm writing some specs for butt-welding some 1928 era reinforcing bars.
Does anyone have any idea what the yield strength of that steel may be?
Under Section of AWS D1.4, the welds have to be tested and must
develop 125% of the specified yield strength of the bars.  What do you think
that yield strength may be?  Could it vary by bar size?  I seem to recall
that back then, certain bar sizes were made from square bars.  I think the
smaller bars were round.  Thank you all in advance.

Bob Garner, S.E.

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