Those buckles were made in 1995 for the SlyTech project that never took place...
Lots of new buckles were needed for 1995, 1996 and 1997, not only for watchstraps, but also for adorning wallets and agendas. The soft high nickle content alloy (used for the 1993 first series Logo buckles) was banned due to 1994-imposed CE regalations regarding skin allergies. Panerai was in deep financial trouble in 1995 and asked their strapmaker to finance & produce the new run of buckles, which were made in much harder 316 steel. They were not laser etched. The overall finish (edges, surface finish and stamp) was rather poor compared to the 1993-produced first series pre-V buckles.
When I started working with the strapmaker in 2001, we used those second series buckles to help him recuperate the money he had lost on them some 5-6 years earlier. Although I personally never liked those buckles - the really strong thing about those straps was the leather part due to the leathers, stitching pattern and, most importantly, the cast iron finishing forms (which we still use today). Those straps were always made with single (floating) keeper.
Didn't get in trouble with Panerai at all (I was one of the lucky fifty invited to celebrate their first 10 years at the Rossini dinner in Firenze, April 2007), but I got a friendly call from Angelo in November 2002 in which he unfolded his plans for using the Logo in their marketing & branding (they didn't want to use it in their first 6 years). The message was clearly understood by me and from then onwards, the buckles for my straps were modified with those 5218-2 (24mm) and 5218-3 (22mm) stamps, as I no longer wanted to be associated with that Logo, for legal reasons of course.
To my knowledge, all these second series pre-V buckles were removed from the planet, but there must have been a couple of packs that the strapmaker overlooked. In 2005, another more commercially oriented strap vendor (no longer in business now) started a joint venture with the strapmaker and bought himself into his company. It was then that these '2nd generation' straps started to appear on the AC, but I had absolutely nothing to do with these (they all had a second fixed keeper and stitching over the whole 24mm to fix the glue between buckle and the fixed keeper). PAV straps and my 2-keeper straps of the present day have just those 5 stitches (not as good, but better looking and historically correct).
Worst part was that these straps were first sold as '2nd generation Dirk' straps, but me and actually the whole paneristi community asked that to be changed, as I had nothing to do with them and could suffer legal consequences if Panerai had associated me with these straps. Seller called them '2nd generation pre-V' straps from then onwards. The regulars here will remember the names and the other 'Dirk' thing...
Cheers,
Dirk