That third link... man, I've gotten lazy. 30 years ago I was writing notation like it uses in the algorithm discussions, and now I just glaze over. I might study it later as a brain exercise. I guess I've been sort of assuming that PCGS does use the simplest chips, just because they're cheapest, and they can't be copied unless you have the slab in hand. (That's assuming that the chip doesn't simply transmit the coin's own certificate number, which also wouldn't completely surprise me.) Do you need a PCGS-issued reader for these, or can you read them with a generic RFID scanner? If the latter, I think it would point to them using the simplest chips... but as I've already shown, I'm a bit out of my depth here.
There would probably be little price difference in simple chips and more complex, programmable chips when bought in quantity. PCGS could certainly order hundreds of thousands at a time. Wouldn’t be surprised if most of the available simple chips are essentially the same internally as the more complex chips but with programmability deactivated. This is a very common practice in the electronics industry. For example, a brand of oscilloscopes may have a line that ranges in speed from 50 to 300 MHz. They are all the same internally. For a higher speed (and price!) model, the higher speed is activated with a code sent into the machine via a USB or JTAG port at the factory. If a customer buys a 50 MHz machine and decides later they want higher speed, they can pay to get a code specific for their machine that they can use for upgrading. The reason this system exists is that it allows for one manufacturing line and bill of materials that can make the whole model line, which reduces manufacturing costs. At the end of the line, the machine is quickly programmed for speed and the appropriate badge (50 MHz, 100 MHz, etc.) is slapped on the case. The higher speed models may sell for several times the price of the lowest speed model. Electronic forums are full of posts of hacks that supposedly can upgrade an oscilloscope for free. I tried one once to convert a 50 MHz scope to 100 MHz and bricked it! Lesson learned. BTW, if a NFC/RFID chip can be read by a simple reader and spits out the same info every time, that doesn’t mean it can’t do more complex tasks if interrogated by a more sophisticated reader. Backward compatibility is common in the electronics industry. Cal
Hey, you're talking to somebody with an 80x60 bottom-of-the-line thermal camera that somehow manages to produce 320x240 images with full accuracy and extended features.
Back to the "coins"; another with bids... https://www.ebay.com/itm/295425339522?hash=item44c8b8f082:g:9QYAAOSwNtdjn0zz 7th cert I have seen on these; used one showing an Oct HA sale:
Latest one is bid over $300; feel sorry for folks who apparently don't know any better... https://www.ebay.com/itm/354466002663?hash=item5287d1f6e7:g:Ai8AAOSw3TZjofMr&amdata=enc:AQAHAAAAkOAaAyksns3F4QERsbaZrO4YkhIiNA3Yp+CQvrpXnBahylXsEo4U1KIbXBZZTSAwVzXpyDuQqeRzy9+tM3bkSRVWwIJ4rKF7ERbaPdSpnrXrGwd14MZ0VMDSZt2YCi03xqqQOzboBy/PmiZGKRHIqm6mdFovBbqx3KyuvNfNBr0Ccp4tpYAWKclqIPS6g6TW7Q==|tkp:Bk9SR6jNwcumYQ
And no apparent end in sight... https://www.ebay.com/itm/266133125033?hash=item3df6c537a9:g:emUAAOSwOdlj7WK4
In my early days of collecting Morgans, I was checking out a set of "Western" Morgans... 1882 CC MS65, 1883 CC MS65, and 1884 CC MS65. Recently, I saw another "Western" set of Morgans, same years, but they were NGC MS64 for $1,275. Any idea of their value? I've looked at several books and magazines and I couldn't find out what the set I bought was worth. That was about 10 years ago. I really don't like having them in one slab. Any idea about the cost to separate the set, and if it would increase of decrease the value?
What's the best source for buying coins from the Central American wreck? I've seen the prices skyrocket recently. Rick is selling the Silver Half Dollar for about $500 and the gold is out of reach of a retired state employee.