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Various countersinks; 
each signed by its maker.
Price: $10.00 each plus shipping.
ACMB-22 through ACMB-27

These countersinks are in good condition, 
with a deep blue-black patina. 

The bottom four have only one cutting edge.
 
ACMB-22 This patent countersink by S.T.D. was sharpened incorrectly.
The patent date is March 1, 1887

Also marked S.T.D. Co. 
as below.
ACMB-23 Another S.T.D. countersink, without patent date, but in excellent condition compared to ACMB-22 above.
S.T.D.Co. is thought to be the 

Syracuse Twist Drill Company

SOLD
ACMB-24 This Bagshaw & Field c'sink has been cleaned & lacquered.
Bagshaw & Field
ACMB-25 Walter & Co. made shaves ... and this countersink.  Fine.
Walter & Co

Cast Steel
ACMB-26 Brown & Flather made braces and bits 1828-1841. Fine.
Brown & Cast

Flather    Steel
ACMB-27 My search of the Directory of American Toolmakers did not reveal the owner of this mark, an "S" inside a diamond. Fine.