Thanks for the information and the links to the 100 Piso notes.
So, it seems that the three letter prefix (followed by six digits) is now nothing unusal for Philippine banknotes. A ''new normal'' perhaps?
It does not surprise me that the polymer 1000 Piso banknote has letter prefixes going up to ''AN'' now because two letters and 7 digits means 10 million per set.
10 million was the ''test run'' issued by the central bank last year. Obviously, these were the ''AA'' notes. If more than 10 million are in circulation than other prefixes must exist.
So far, the polymer notes have been printed in Australia. Perhaps, the BSP prefix ones are the first polymer notes printed in the Philippines? Okay, I am speculating here. But BSP is a strange prefix at this stage.
There are presently two banknote printing facilities in the Philippines. The ''old one'' (scheduled to be closed in the ‘’near'' future) and a ''new one.'' Both run by the central bank. Again, I am speculating. But is it possible that only one of these facilities can print the ''NGC Enhanced notes with the tactile marks'' and the other not? And demand for banknotes is higher than the production capacity at one plant. Thus, both series are being churned out.
I have also read that the polymer 1000 Piso banknote is unpopular in the country.
A trading buddy of mine stayed in the Philippines for a couple of months last year. He said the same thing about the quality of the banknotes in circulation as you.
Likewise, he found fresh NGC notes with and without tactile marks.
He did find 20 Piso coins. They were not rare. Perhaps, the distribution of the 20 Piso coins is a regional thing. He stayed on an island in the south-west of the country.
Finally, if you find or have an extra uncirculated 1000 Piso polymer banknote, feel free to contact me.
