Not my note, unfortunately. Just saw this posted on Reddit. New serial number not previously listed in the CPMS registry.
-Thanks for the correction @rxcory - yes the ERG $20 (was just replying off-the-top of my head, trying to recall some of the short prefixes reported).
I did not mention the 2011 HAE-HAL Fives only b/c we expected those to be short & the ones I mentioned came up short more in the middle of their run (with the exception of the 2011 AUT $20). There's probably a few more short prefixes I failed to mention here.
I think eventually as more appear on the market the charlton guides will eventually reflect on their true value.