The word "Copyright" was added to cards for prefix
number 273 onward.
Prefix 284 can be found with and without "Copyright".
251, 252, 255 & 256 don't have the word "Copyright".
Beware that these are not the rare missing "No Copyright" version.
There
were approximately 7,000 of the 284 that are the rarity.
284 "Copyright" version.
284 "No Copyright" version.
Pre 376
376 onwards "Non Refundable"
