What is tooled? 0

[Scrowzer68]

Just wondering why my precious coin could not be graded?

[comicdonna]

Tooling marks are specific to the die that struck a coin, making them important tell-tale features of counterfeit coins. Knowledge of die diagnostics is usually acquired by examining countless coins over a period of many years, but specialized references that illustrate tooling marks on counterfeit coins do exist.

[Coinbuf]

Tooling can mean a few different things, I'm not familiar with your coin type so I cannot comment on why it was determined to be tooled.  Hopefully another member can explain in more detail.

[Conder101]

Tooling MARKS are the result of repairs or work done to the die. TOOLING, is another term for reworking, strengthening, or reengraving details on the already struck COIN.

[RWB]

Several points:

1) Your photo is not sharp enough for detection of any alterations to the surface; also show both sides.

2) "Tooling" usually refers to alterations made to the coin in order to strengthen or restore details. Usually this is done to deceive a buyer into thinking the coin is of a higher, more desirable, grade. A workman uses a sharp steel engraving tool to move metal on the coin. This is easily detected by expert authenticators. Tooled coins will be rejected for authentication because they have been altered.

3) Changes to a working die are called "reengraving" in deference to the work being done by a mint employee, usually an assistant engraver. Reengraving is part of a working die and is not, alone, cause for rejection.

The confusion of usage mentioned by other posters is a strong argument in favor of clear, unambiguous numismatic terminology. My personal suggestion is to limit "tooling" to post-mint alterations to a coin; and use "reengravijg" only for mint-made engraved alterations to a working die.

Edited February 10, 2021 by RWB

[JT2]

12 minutes ago, RWB said:

The confusion of usage mentioned by other posters is a strong argument in favor of clear, unambiguous numismatic terminology. My personal suggestion is to limit "tooling" to post-mint alterations to a coin; and use "reengravijg" only for mint-made engraved alterations to a working die.

If you dont you will just be a TOOL........hahahah j/k

[MarkFeld]

50 minutes ago, Conder101 said:

Tooling MARKS are the result of repairs or work done to the die. TOOLING, is another term for reworking, strengthening, or reengraving details on the already struck COIN.

Yes, as Conder101 indicated, “tooled” as used by the grading companies, means that work was done on the coin after it was struck and outside of the mint. 
From the NGC website:

“TOOLED refers to either the smoothing of a coin's fields to remove scratches, corrosion and other forms of damage or to the restoration of lost details through use of a graver or knife. When a single side of the coin is affected, the terms OBV TOOLED and REV TOOLED are used.”