Thanks Scott for contributing to the topic.
the plot thickens : labels are prpbably not the discriminating element to tell the 2015 version from the latest iteration.
I am pretty sure Panaracer released a new pari-moto version, because they are now listed as tubeless compatible on their website : the casing must be different.
Regarding the 60 tpi tan / 120 tpi black versions, i do think they existed only on the first batch.
The screenshot below comes from the panaracer 2015 catalog .
As you can see, a gravel specific version existed.
IMHO, this version became the current Gravelking 650b, mainly due to the fact that the casing labels are the same (ZSG, anti-flat, etc..see screenshot below)
As to my original question, I am convinced that Gravel kings are the way to go : I won't be commuting with these tyres, but I will be inevitably be rolling on glasses...