Different Planchet? 1991 50¢ - Coin Community Forum

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Author	Replies: 8 / Views: 2,447
Jeff Pillar of the Community Australia 877 Posts	Posted 06/16/2010 6:44 pm I was just counting out some coins for an order and noticed a stack of 10 x 1991 ramshead 50¢ looked distinctly taller than similar 1969 stacks beside it. Removing one coin from the '91 stack brought it back to similar height to the 1969. Thinking I must have counted wrongly I checked and each stack was 10 coins. The '91 stack measued 26.0mm and the '69 piles 24.2mm (all good condition coins with little wear and no big rims dents). Counting out stacks of 10 from my change tin gave measurements ranging from 24.2mm to 24.8mm. My digital coin scale (resolution to 0.01g and I think accuracy ±0.05g about right) showed average weight of 1991 to be approximately 0.2g more than other 50¢ coins. The most obvious conclusion is that 1991 planchets are thicker! To my eye there is no difference in the rim edge, which could also account for this. Has anyone else noticed variations in thickness of coins that should all be the same? cheers Jeff Report this Post to the Staff

Darth Anarchus Pillar of the Community United States 1388 Posts	Posted 06/16/2010 8:55 pm That's strange because the silver Halves should weigh more... not by much, but they should... Report this Post to the Staff
latman100 Pillar of the Community Australia 1040 Posts	Posted 06/17/2010 10:28 pm This is the Aussie section Darth Anarchus, the only silver Aussie 50c was 1966, and that is a round coin as opposed to the dodecagon shape from 1969 onwards. Report this Post to the Staff
syp-2010 New Member Australia 3 Posts	Posted 07/14/2010 08:11 am Hi Jeff, I've just inherited a collection and found amongst the 1962 Australian pennies, one that appears to have no rim, making it slightly smaller in diameter and also appears to be from a thinner planchet. This apparent thinness may be purely because there is no rim, but it looks and feels quite lightweight. Also the strike seems quite soft and lacks distinction. There are three pics here showing it alongside a standard coin. I'm a real novice and would very much welcome some feedback... Report this Post to the Staff
appleangel07 Pillar of the Community Australia 1607 Posts	Posted 07/14/2010 10:45 am Penny struck on a halfpenny planchet,weigh the coin to make sure,halfpenny weighs 5.6 grams,a penny weighs 9.4 grams. Report this Post to the Staff
syp-2010 New Member Australia 3 Posts	Posted 07/14/2010 11:27 pm You could be right. Don't have scales (novice!) so did a rough check at the post office 5 grams vs 9 grams. Have since read more about the minting process and what you say makes sense if a halfpenny blank was used. Thanks for your help... Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21788 Posts	Posted 07/17/2010 06:38 am There to me, seems to be a difference in planchet weights, which must be checked accurately.. I have a British penny of 1967, which is only 65% of the correct weight. The coin is otherwise of the correct diameter and is perfectly struck up. Dave Allen, a highly respected numistmatist a well known coin dealer, explained to me that when The Royal Mint was moving from Tower Hill London to Llanstrisant in Wales, some of the employees were more than a little 'miffed' that if they were to keep their jobs, they would have to move house out of London. Some the lads put all sorts of planchets through the presses and threw the results over the walls, out into the streets, where they would be picked up. Apparently, I have one of theses 'mint sports'. Edited by sel_69l 07/17/2010 07:15 am Report this Post to the Staff
syp-2010 New Member Australia 3 Posts	Posted 07/18/2010 02:10 am Thanks Sel_691, I will get its weight checked out. I guess that signifies two issues. One, that the weight may indicate a different planchet, but there is still the smaller diameter 'no rim' factor. From what I've read, could I summise that the formation of the rim may have been missed due to the underthickness of the blank...maybe? Report this Post to the Staff
gxseries Pillar of the Community Australia 3831 Posts	Posted 08/15/2010 12:30 am Probably the planchets were sourced from a different supplier. My partial coin collection http://www.omnicoin.com/collection/gxseries My numismatics articles and collection: http://www.gxseries.com/numis/numis_index.htm Regularly updated at least once a month. Report this Post to the Staff
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