The .zip extension signifies standard data compression. The trailing number 3 typically points to one of two historical constraints:
This typically denotes the specific model, photographer moniker, or specific website brand responsible for curating the imagery. Mrs-Virgin 2011-10-29 REGULAR GALLERY No.374.zip 3
If you are trying to find or catalog a specific set of historical images or documents from this particular timeframe, consider checking out verified archiving portals like the Internet Archive for safely indexed metadata. Mrs-Virgin 2011-10-29 REGULAR GALLERY No.374.zip 3
The suffix "3" often suggests either a part 3 of a larger release set or a subsequent version of a recurring gallery archive. Digital Preservation of Adult Content Mrs-Virgin 2011-10-29 REGULAR GALLERY No.374.zip 3