I am sorry I just looked at the photo and it really stinks somethnibng happended with the scan when I postedit is sort ofall out of shape and focus
so this photo you can barely see anythinghb of waht the coin reaLly looiks like
I apologise
but you advanced numismatists are smart on here as even witrh the stuffpy really bad scans and then posted here they are worse really good astute observations
the proof gold coins of the civil war era are 90% gold and not the usual 10% copper but actually 3% silver and 7 % copper which gives them a more silvery look I guess it is hard to explain but it is well a different look than a later 19th century proofd gold coin with 210% copper hsard yo explain and since I got no pghotos to show hard to explain but I guess if you specialize in these coins during certain decades you can tell for the most part a decade depeding on woh the coin looks also usually with the silver alloy these coins weather is it the alooy or a combo of alooy and planchet prep you get many planchet flaws like striations and as such which this coin has a couple but really does jnot affect the grade or eye appeal unless it is well really hits you
also there is a strike thruogh on the shield which is not post mint but done during the mintihnng process and really does not affect the grade
unfortunaytely and this is ducomen6ted at the mint in their records but after the suspension of spece payments in 1862 these coinsa aftetr they where struck like many other gold coinsa were not released into commerce as by then it took almost three times as much federal new federal paper monry to buy one dollar of gold so this coin would havre cost someone 8 or so dollars in federal green backs to buy this quarter eagle along with the proofing charge so they just sat in a desk drawer at the mint many years untill they where eventually sold and some complains were brought to the attention of the mint supertendant in the 1870's that clears did not care too much for the proofs or how they where kept handled
as many were somewhat skuffed now this coin has some skuff marks as not seen in this photo but it really has a gem look with haze from long term storage in paper envelope that did not come into the numismatic marketplace for storing coins until the later 19th century
maybe 1885 or so?
and so pcgs graded this coin proof 63 cameo
now in person the mirrors are super monster deep and the coin is basically a deep cameo but the haze and sort of thicker coloration causes the coin to just miss the deep cameo designation and the proof 63 grade it acvcurant and with just a few skuff marks and abnsolutely no hailines at first glance it looks like a supeb gem proof with great eye appeal and on closerexamination it still has killer eye appeal but only proof 63 and a liner deep cameo
so eventually another owner of thecoin might send it off to some dipper and stripper or conservation as it iscalled to try for the deep cameo
which it has a good chan ce of making but then it kills the original skin
well after seond thought this was a really poor example and even worse photo to use sorry but well fair is fair and as such this is the particulars and grade of this coin which can only be understood and apprecaited in hand sight seen

thnaks for the really astute comments and also the participaTION