Naples And Sicily 1 Tari ? 1684

There is some variety within 1680s dates of the tari and carlino, or 1/2 tari (and it should be noted that this coinage is fairly "available" in general)... including a switch to using the portrait. As you noted, the 1684 typically has the incuse date, 1685 and 1686 have raised date.

BTW, this piece is specifically NAPLES (this region most of the southern part of mainland Italy), not "Naples and Sicily"... Naples and Sicily were two separate provinces under the King of Spain, with Sicily having a separate coinage (confusingly, though understandably, with similar denominations of tari and grana/grano, but Sicily's versions had devalued intrinsically relative to Naples). Only later in the early 1800s did the two realms consolidate into "Naples and Sicily", or the "Two Sicilies", using one coinage (that which had been Naples').

First world silver and you're already looking on foreign language forums - that's diligence.

This wasn't a variant I was even aware of... Poking around a bit and the version with the mask does definitely seem to be a scarcer type (many more non-mask 1684 around), and the few auction appearances I'm seeing bear that out. Turned out to be a fortuitous buy.