It is a smaller 8 in sweep brace, a most useful size for most tasks
The Stanley No 923 was manufactured from 1905 until 1984.
It has a box ratchet and earlier models had alligator jaws.
Made in sizes from 6 to 14 in in 2 in increments.
Steel construction, nickel plated, cocobolo handles.
Average value $10-50. I paid $5 at a Flea market for mine.
6 in size $50-100 (because rarely seen)
John Walter's book prices
Stanley No 923-8
Also stamped BT Co, which stands for Bell Telephone Company.
This model was used by Bell linemen and service guys...for good reasons
The ratcheting mechanism is covered under Patent 2,485,991
Applied for 10 Apr 1946
Granted 25 Oct 1949
2 jaws chuck, closing tight
This chuck has two springs.
You can see one peeking out on the side of the chuck
It does not sport the usual Alligator grip on the jaws,
like the earlier models.
Note that this type of jaws are designed to hold square tapered bit shank, not round ones. As a result they are sometimes found with vise grip like, scored marks on the chuck in a futile attempt to grab on solidly round shank bits...Please don't do that.
These jaws were made under US Patent 1,880,521 which covers the spring arrangements.
Applied for 13 Sep 1929
Granted 4 Oct 1932
Chucks that uses springs should allowed the jaws to open and close smoothly when you open/close the chuck. Often they are sticking, because of roughness inside the chuck shell and/or accumulated grit and gummy dried grease. Both conditions easily fixed.
This is a Made in Canada Stanley
This small size, 8 in sweep, is probably the most used in cabinetmaking. The smaller 6 in does not comes up very often, while the 8 in and 10 in are very prolific out there. An indication of their all around usefulness.
The patent dates on it dated it from 1949 at the earliest, probably early 50s.
I used to keep a a small Millers Falls of that size on my bench, but it had some issues (worn out ratchet) This is my new 8 in going into my boring till to replace it.
Bob, about to go on a short road trip with Jean, the grand peanuts and Rudy.
Good thing I had the AC fixed in the car :-)