That Last Mark - Vatican II Medals

[GregbythePond]

There are three (3) marks on these (Vatican) Italian medals circa 1966. The first two are identified, the last one is not. * 264 AR is the Arezzo maker,  925 is self explanatory. However, the third mark would appear to be the  letters T, N & L overlapping. Has anyone seen this one elsewhere & what does it mean?

[Figleaf]

Have you identified the medal? A photo of the whole thing might help...

Peter

[GregbythePond]

As described, everything else is clear enough. It's just this one registration mark ... The full size images of the obverse and reverse, exceed the file size limit.