I thought this was the first #23 variant made, and I believe the #23s were the first pattern made. But I emailed GEC after getting one for more info because I was writing an article on it and they said it wasn't the first variant.
Which makes sense, because its serial numbers are high than those on other variants. For example, my red diamond bone that I sold to get the laser etched white bone had a lower serial number. For that first run of #23s they did serial numbers across the whole run, not each variation. So serial number 02 is probably the first GEC made other than true prototypes and the serial number 00 or 01 that the factory typically keeps.