Damage Or Natural Hair lines

[leprecoin]

I use to dump all coins that have fine hair lines,

but then I noticed some of the high end grades have those.

Am completely confuse as of how to determine, what is damage from cleaning or "stress hair lines" (or otherwise names for fine hairlines)

 

Any rule of thumb ? any advise at all ?

 

The Ike in the Pic is a PCGS 72D MS67

[coinman1794]

Many IKE dollars have heavy die polishing lines. These do not affect the coins grade, as they are a part of the dies. Some IKEs also have fine parallel hairlines on them that are actually marks in the planchet that still show after striking. These don't usually affect the grade either, unless they are very severe. The latter seems to be what is affecting the 1972-D that you have posted from Heritage. The following 1972-D NGC MS67 has many die polishing lines on each side, but does not have the planchet defect lines just mentioned.

 

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=200224256448&ssPageName=STRK:MESE:IT&ih=010

 

 

[RareSov]

It would seem that very very tiny (maybe microscopic) hairlines on a polished die could be transferred during striking. These would be best called pressure lines ?

[coinman1794]

Often, coins will show pronounced "flow lines" around devices and towards the rims when a die begins to wear. This affect is in the dies. However, normal flow lines are a result of the metal in the planchet flowing into the dies and forming the design and, this is not related to the dies.

 

In terms of polishing lines, generally, even the most subtle lines will be transfered from die to coin.

[BankNote1]

Die polish or flow lines or what ever you want to call them are raised on the coins surface. Cleaning hairlines etc. are into the surface of the coin.