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1977 Nickel Dollar - Grease Fill...?

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Rest in Peace
wert's Avatar
1988 Posts
 Posted 05/12/2012  10:53 pm Show Profile   Bookmark this topic Add wert to your friends list Get a Link to this Message Number of Subscribers
Hi guys

Are these short water lines caused by Grease Fill...?


1977-Nickel-Dollar---Grease-Fill...?

1977-Nickel-Dollar---Grease-Fill...?

1977-Nickel-Dollar---Grease-Fill...?


1977-Nickel-Dollar---Grease-Fill...?
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SPP-Ottawa's Avatar
Canada
10463 Posts
 Posted 05/12/2012  11:17 pm  Show Profile   Check SPP-Ottawa's eBay Listings Bookmark this reply Add SPP-Ottawa to your friends list Get a Link to this Reply
Almost all SWL varieties, both in the silver and nickel dollar series, are basically the result of Die Deterioration. Die Deterioration is a "catch-all" term to describe the net result of the wear of the design elements on the die, which could result from any number of processes:

- overpolishing of the dies
- overuse of the master punch (which creates the dies)
- die wear or fatigue, which occurs near the end of a die's life (this phenomena is unlikely the culprit for SWL, but it created the nice 1c doubled 979 coins)

Bear in mind that we are speaking on the context of 1960s to 1980s minting technology. It gets much more complicated with older coins, and Rob Turner's books are excellent reads for someone who wants the depth and details of early Canadian coin production. I am sure there are other possibilities that cause the SWL effects, but these are not considered error coins. A coin Struck Through Grease, however, is.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer

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pennysaver's Avatar
Canada
937 Posts
 Posted 05/13/2012  07:20 am  Show Profile   Bookmark this reply Add pennysaver to your friends list Get a Link to this Reply
Hi wert

I've collected these 1977 1$ short waterline varieties for years now and I've found that there are degrees of variation in the length of waterline, both on the front and the rear of the canoe. They can range from short lines, medium lines, full length lines, lines that just barely touch the canoe, others where they make full contact, cases where one or two touch and the others do not, and even times where the ends of the lines at the front of the canoe nearest the beads are quite strong but near the canoe are quite weak. To my mind these varieties look like a progression of over-polished dies rather than a spot or two of grease on the die. SPP is correct in his reasons for loss of detail on various coins, but the rest of the detail on the reverse of the 1977 dollars always seem to be pretty strong throughout, so IMO the varities you're describing are a result of good old over-zealous polishing.

And is that a nice chain die crack running through the beads I see in your coin?! Doubly sweet! And check for attached beads/not attached beads on the queen's crown on the obverse. There's a couple of minor varieties there, too, in the "distance" the beads appear to be from their mounting.

Hope this helps!
Rest in Peace
wert's Avatar
1988 Posts
 Posted 05/13/2012  09:48 am  Show Profile   Bookmark this reply Add wert to your friends list Get a Link to this Reply
Thanks SPP and pennysaver

I now have a better understanding ( and still learning) of these nickel dollars.

I have more, and I WILL keep looking.....Thanks again guys.
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