[FONT="] The established date for this medallion begins in 1860. It is necessary to point out that the date is not precise, as in, "it was put on saws starting on the date 1/1/60." There is no evidence to put most of these production dates to anything closer than a reasonable estimation. For example, this one may have appeared initially on any date between, say, 1858 and 1862; there is no evidence to say precisely.\
Source--and a good one for Disston saws:
[/FONT]http://www.disstonianinstitute.com/medv2.html