Jump to content
British Coin Forum - Predecimal.com

50 Years of RotographicCoinpublications.com A Rotographic Imprint. Price guide reference book publishers since 1959. Lots of books on coins, banknotes and medals. Please visit and like Coin Publications on Facebook for offers and updates.

Coin Publications on Facebook

   Rotographic    

The current range of books. Click the image above to see them on Amazon (printed and Kindle format). More info on coinpublications.com

predecimal.comPredecimal.com. One of the most popular websites on British pre-decimal coins, with hundreds of coins for sale, advice for beginners and interesting information.

ozjohn

Accomplished Collector
  • Content Count

    1,103
  • Joined

  • Last visited

  • Days Won

    39

Everything posted by ozjohn

  1. Thiele, A. N., "Loudspeakers in Vented Boxes: Parts I and II," J. Audio Engineering Soc., Vol. 19, No. 5, May 1971, pp. 382–392 (Reprinted from The above paper may be of interest if you are technically minded. It describes the design of bass reflex enclosures using second order control theory. I think audio reproduction has been revolutionised in recent years by the use of adaptive equalisers in tuner amplifiers where the response of the venue is scanned and the frequency response of the system adjusted accordingly. Using this very ordinary speaker systems can produce high quality results. I first saw this demonstrated when I was a student where students had to present a project as part of their course work to their fellow students and academics.
  2. ozjohn

    1917 Sixpences Grading

    Sorry about the 1976 error a silly typo.
  3. ozjohn

    1917 Sixpences Grading

    Check out this 1976 sixpence on Ebayhttps://www.ebay.co.uk/itm/1917-Great-Britain-6-Pence-PCGS-MS-66-Sixpence/173568759924?hash=item2869811874:g:eIsAAOSw9w1btBPg and PCGS https://www.pcgs.com/cert/34024776 It's nothing on ypur one.
  4. ozjohn

    1917 Sixpences Grading

    Like the other posts I have difficulty in grading early George IV silver coins. When all else fails I suggest examination of the milling as that always seems to be deeply struck and an early indication of wear.
  5. https://theassayoffice.com/tarnish_labexpert Food for thought. However my major concern is not so much the slabbing process more the inconsistencies of the grading outcomes for some coins. Always buy the coin not the assigned grade.
  6. ozjohn

    Ebay's Worst Offerings

    11/9 instead of 9/11? Also the numbers used for the US emergency telephone service.
  7. https://www.ebay.co.uk/itm/Edward-V11-A-UNC-1905-Half-Crown/265082338390?hash=item3db8237c56:g:YvoAAOSwxCVgR2La This halfcrown has the wonky I in the QVI on the reverse that indicates it maybe a fake. What does everyone else think?. I hope know one is taken taken in by it.
  8. ozjohn

    Possible Fake 1905 Halfcrown

    I’m wondering if this coin is a fake of a fake. Most posts point to the obverse of the coin not being right. Although when I first saw the coin I thought it didn’t look quite right it was the crooked I in the QVI in the garter on the reverse that convinced me it wasn’t kosher.I checked this against the illustration in the fakes post in these forums and on examination of the original photo of the fake in the fakes post looked much more convincing than the example in the EBay listing.
  9. https://www.numismaticnews.net/world-coins/fluorescent-light-coin-examinations
  10. Try IfanView 64 or 32 which ha a resizing function.
  11. Very nice. Large coins such as crowns collect surface marks due to their extra weight. Your coin is better than most of the 1/2 crowns graded Ef/g EF. Also the leaves on the reverse are much better minted than most halfcrowns of a similar grade.
  12. EBay charges 10% GST on goods going to Australia and should not be charging VAT on exports from the UK.My advice for buying overseas coins from Australia is to buy from the seller’s site not EBAY if possible . You may be charged the UK VAT, which should not be levied but you will most probably avoid the Australian GST.
  13. A 1931 florin I have. I would like your opinion. If it a mint error or damage from circulation. All are appreciated. It has to be said that the milling is very good
  14. Hi Vicky, Here's a close up of the effected area. There seems to be a line through the center of the indentation that looks like it could be a metal flaw. There doesn't seem to be any pitting that you would expect with corrosion. Regards, Oz
  15. Poinciana tree, delonix regia from Madagascar and even more spectacular than the jacaranda. It thrives in Queensland but not in Sydney as it is tropical in its requirements. I have seen them flowering in Egypt and often you can see them in the background in the TV series Death in Paradise. These trees flower in December.
  16. Hi Blakeyboy, I cannot remember if I said this before. With the remaining seeds boil a jug of hot water and pour on the seeds and let soak over night. Then plant as normal. If you need some more I can harvest form this year's growth when they are ripe.. At present I am trying to pollinate a vanilla orchid I have. It grows like mad and producing a lot of flowers but pollinating it is a skill I have yet to learn. Regards, Ozjohn
  17. Hi Blakeyboy, Did you receive the second envolope containg some dwarf poinciana seeds? Good to hear the poinciana seeds are going well. Ozjohn.
  18. Photo of a Jacaranda tree taken a week or so ago at Laidley Qld. Jacarandas flower in Oct/November and mark the start of the exam period at High Schools and Universities.
  19. Messy perhaps but the carpet of spent blue flowers are a sight to behold.
  20. Yes a spectacular tree native to Brazil widely planted around the world. I've seen them growing in LA and Spain as well. Grafton, NSW holds a Jacaranda Festival every year in November I'm sure they are grown in South Africa.
  21. ozjohn

    Cleaned or not?

    Received the 1920 halfcrown graded by PCGS as AU detail cleaned. On examination there is no obvious sign of cleaning and in hand has reasonable luster. IMO the coin seems trouble free.
  22. ozjohn

    Flatbed scanners

    I agree flatbed scanners tend to make the high points appear to be flatter than they are also the lustre of the coin is not captured. Having said that I find it very hard to get a good image with a camera and as a result mostly use a scanner. Any insights on taking a good coin pictures would be appreciated. I've tried natural lighting and LEDs but the results are variable. I think getting the lighting right is critical for good coin photography.
  23. Just to return to the subject of this post I checked the specs. of post 1860 pennies https://en.wikipedia.org/wiki/Penny_(British_pre-decimal_coin) According to wikipedia the alloy used for post 1860 pennies was Cu, Sn & Zn in varying quantities but with 95 to 97% Cu. Therefore the content of other metals in pennies was very small making the price of scrap Cu as good guide as to the melt value of pennies.
  24. Bronze contains about 10% tin a much more expensive metal than Copper. About three times I think.
  25. A palm my wife photographed in Brisbane's Mt. Coot-Tha botanic gardens growing in one of the beds. Many palms have dangerous thorns but this one is something else. It's a Salacca palm from Indonesia that bares an edible fruit. Can't say I would be too keen to pick it.
×