Frosting Error On 2011 Reverse Proof?

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Author	Replies: 3 / Views: 2,222
ilikeikes Pillar of the Community United States 1205 Posts	Posted 11/20/2011 12:10 am I'm sorry, but, tonight I am having a heck of a time shooting this...what I see on 2 of my 25th Anniversary Reverse Eagles is a very distinct line of frosting that has bled onto the Letters and stars(left side, all around, then, bottom of same, at base of coin))..it's almost as if someone pin-pricked perfect lines of dots to the edge of each letter, making a really cool-looking "look"..VERY hard to pickup, will try again tommorow for a better pic detailing this..each letter and star has it, viewable with 7x loupe...3 coins don't have this issue...looking at this closely, it would appear to be something related to the 2nd, and 3rd strike(if there is a 3rd strike), where there was a shift, or movement on the die...on a non-proof coin, this would probably show as Machine Doubling, and, a small thin plate would form left of each letter and star, not uncommon on Modern Coins. On this particular Eagle, the frosting has crept onto the areas, making a perfect perimiter of frosting on each letter and star...anyone else seeing this on their Reverse Proofs, let me know...I don't think it's a big deal, but let's see what plays out here... Coins(4 sets) were ALL out of holes and loose from shipping/poor packing...4 coin capsules are cracked, but, did their job, and, protected the coin from a pretty serious blow along transit to crack that thick of plastic...wow..most coins seem to be MS/PF69's, most with very minor blemishes...maybe 2 or 3 70's in the lot....all 4 Reverse Proofs show some sort of tiny set of scuff/scratch or blemish, confined to lower letters on reverse, and 1 on shield...bummer...not perfect, but, still, acceptable I suppose...just glad to get them....I actually like the overall look of the NO-Mint S coin the best, for it's Matte Finish appeal.... Report this Post to the Staff

sel_69l Bedrock of the Community Australia 21788 Posts	Posted 11/20/2011 12:50 am I think what you have ahown is a masking error, in the preparation of a reverse proof. I appreciate it would be hard to get good pictures, with a problem that would be easier to see 'in hand', but you have done well with the camera. To see if the frosting mask has shifted, rather than use of a mask that has provided less than perfect coverage of the detail, other parts of the coin need to be seen. I assume from what you say, these coins are at least double struck in their normal production. If the partly struck up coin had shifted under the die, frosting should appear on other parts of the coin after the first strike. Report this Post to the Staff
clairhardesty Pillar of the Community United States 1027 Posts	Posted 11/20/2011 11:19 am There is not actually a masking step in the preparation of the RP die. The die are first polished completely smooth, then a computer guided laser is used to create the surface texture in the desired areas, then a chrome-nitride layer is vapor deposited to harden the entire die face. What you may be looking at is a mis-alignment of the die during the laser step, a shifting of the entire "image" being applied to the die. If that happened, it should also be visible on the main devices but may be more difficult to see there if the mis-alignment is small. It is possible that this amount of mis-alignment is perfectly within spec and we may see other coins with different shifts. What you most likely have is coins from two different die pairs. I doubt that it is related to movement between strikes unless you see the normal evidence associated with Machine Doubling as well. As a side note, the laser is not used to create the surface treatment on the uncirculated die. They are vapor "sand" blasted. Here is an image of a circulated 2005 bullion SAE showing how easily the mint luster wears away and just how thin it is. This "matte finish" is a beautiful but very fragile surface. Report this Post to the Staff
ilikeikes Pillar of the Community United States 1205 Posts	Posted 11/20/2011 12:10 pm Thanks ClairH..the 2 Reverse Proofs sure look neat with this issue, makes for a unique look, for sure. Calvin Report this Post to the Staff
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