Gauge and frame would only give you a rough idea of where it started.
A search will find this topic discussed many times. Along with what was the thinnest walls that are factory original.
The thinnest damascus I shoot measures just above 30 thousands. Way more than anyone's recomened minimum.
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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