Some dealers do not accept Credit Suisse Bars as recognized bars. If you say the picture on the coin or bar is meaningless to you, would you be ok with buying a generic 1 kilo gold bar for current market price? Absolutely no certification or anything stamped on it? Things like these make people decide not to purchase certain assayer's bars. "It is only the weight that matters" If i sent you a gold bar that weighed 1 kilo and was the size of a netbook, would you accept it and give me 32 GRC? I THINK NOT. That would truly raise a red flag at why a gold kilo bar is that big. There is more to this problem than just centralizing the coin. The gold and silver would also have to be assayed and stamped at the same refinery in order to meet the same qualities for each thing. So lets say this concept is put into play, if I sent you 500 Pamp 1 oz gold bars, and I wanted them back later on, and you decide to send me 500 1 oz JM bars, then I have basically lost $20 x 500 dollars worth on my gold.
I don't think you're getting it.
A - Your example of the 1kg gold bar that is the size of a netbook... This is like asking me if I'm prepared to give you 32GDC for for a 1kg Toblerone bar covered in gold colored foil. No. I'm not. If you're not giving me gold, you're not getting GDC. Testing what I'm getting would be part of the process, obviously.
B - If the name matters to you... fine. That's because you're looking to trade in dollars and the amount of dollars someone is willing to pay for 1kg PAMP bar is different that a 1kg JM bar. This is irrelevant because the trading that happens is not in dollars, or PAMP bars, or bags of loose silver dimes. The trading happens in GDC and SRC, just like trade happens in BTC now. Outside and beyond me, the issuer, the rates will float around as the markets see fit, bearing in mind of course, that anyone who comes to me looking to trade their GDC's and SRC's for metal, will be getting back pure metal only, irrespective of the mint. Hell, if I were to amass enough of it, I'd probably be melting it down and reminting it, just for the sake of vault uniformity.
C - I would not be a bank, so any talk of getting the same particular metal out that you may have put in is nonsensical, and would be the result of luck. You might as well ask if you can get back the same exact dollar bills from the ATM that you deposited in cash a week earlier.