On Thu, Jun 15, 2017 at 12:49 PM, Ken Wright  wrote:

>   Closer inspection shows a Disston & Sons medallion with the number 57
> near it.
>

Ken

Most Disston saws don't have a number stamped on the handle.  That is
probably a user's mark (school or workshop) to keep track of whose is whose.

Regarding Backsaws, most it seems are #4s.  There is a nice article on
dating etc here.  Most are marked on the back, not etched, based on my
experience of N=5 (3 stamped, 2 not)
http://hus-saws1.wkfinetools.com/Disston/tools/Baker-
DisstonDating/datDisston-01.asp

But if it isn't a number 4, start here and guess based on # of screws
http://www.disstonianinstitute.com/backsawpage.html


-- 
Kirk Eppler in Half Moon Bay, CA, who spent last evening botching a
resharpening on a 10" Davis #0, and will start over this weekend