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Question about Polish Gdynia 10 Zlotych

BjornBjorn Posts: 538 ✭✭✭
in World & Ancient Coins Forum
Hello guys!

I was recently comparing two coins - both 10 zlotych pieces from Poland, issued to commemorate the 50th anniversary of Gdynia. I noticed that one has a much thicker planchet than the other. Does anyone know if the Polish Mint issued coins of separate thickness that year?

Bjorn

Comments

  • BjornBjorn Posts: 538 ✭✭✭
    Heh, no one? image
  • laurentyvanlaurentyvan Posts: 4,243 ✭✭✭
    I will respond to say hello and keep your post visible but I have no clue.image
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  • lordmarcovanlordmarcovan Posts: 43,885 ✭✭✭✭✭
    Same here. 'Fraid I had no clue, either. image

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  • coinkatcoinkat Posts: 23,845 ✭✭✭✭✭
    Have you weighed two separate examples? One with the thicker planchet and the thinner- if so what is the difference?

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  • tbirde56tbirde56 Posts: 2,161
    Not marked 'proba' I assume.
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  • laurentyvanlaurentyvan Posts: 4,243 ✭✭✭
    Not marked 'proba' I assume.

    Probably...image
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  • BjornBjorn Posts: 538 ✭✭✭
    Thanks for the replies so far guys!

    I will try to get some pictures up later today. I checked for proba when I first noticed the discrepancy in thickness - but no sign of it on either coin. Also my scale (arguably not very good) detects no difference between the weight - although the one coin is much thicker than the other and shows no signs of being hollowed out, or otherwise altered post-mint.
  • secondrepublicsecondrepublic Posts: 2,619 ✭✭✭
    I assume you're referring to the 10 zlotych dated 1972... according to my Polish coin catalog the weight on these is supposed to be 9.5 grams. Yours may have been struck on a different planchet. I would suggest weighing them both on a more accurate scale. Seems hard to believe there would be no difference in weight if it's the same material and one is thicker.

    Two questions... how thick are each of them? And, do they appear to be made of the same material?
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  • BjornBjorn Posts: 538 ✭✭✭
    Here are some pictures, including an edge shot. I'll edit this post with thickness once I measure them... the thinner planchet is on the left in the first two pictures. These close ups have also convinced me that I need to give the thicker coin an acetone bath!

    image
    image
    image
  • LancastercoinLancastercoin Posts: 251
    The coins were struck in two different collars, which makes a surprising difference in the perceived thickness when viewing the edge. I guess you guys have never looked through rolls of US coins before you were into world; it's amazing the difference you see in silver dimes, quarters, and halves that are all BU. All it is is the collar, or so it was explained to me by a guy who has his own mint anyway (Dan Carr).
  • secondrepublicsecondrepublic Posts: 2,619 ✭✭✭
    It could be the collars; but I would still suggest having it weighed on a precise scale.
    "Men who had never shown any ability to make or increase fortunes for themselves abounded in brilliant plans for creating and increasing wealth for the country at large." Fiat Money Inflation in France, Andrew Dickson White (1912)
  • ormandhormandh Posts: 3,111 ✭✭✭
    Yes, I would have to agree that you should weigh each. It appears to me that one has been struck in a smaller collar.
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  • BjornBjorn Posts: 538 ✭✭✭
    I had forgot about this thread until the unfortunate news today reminded me of it. I had weighed and more carefully measured both coins:

    The seemingly 'thicker' coin - 9.74 grams, about 2.2 mm thick planchet

    The seemingly 'thinner' coin - 9.42 grams, about 1.8 mm thick planchet

    So, probably a question of collar width with a slightly heavier planchet as well... or so it appears!
  • 1jester1jester Posts: 8,637 ✭✭✭
    I've never seen this before. However, it is not out of the realm of possibilities for an incorrect, but similar, planchet to have been used, and indeed the lighter coin is also the thinner one, so if a smaller, lighter planchet were to have been used, it would display the characteristics of your mystery coin. Sorry I'm not of much help.

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