I'm a collector of parker pens and in particular the Vector, 88 and Rialto Models. These pens are often considered insignificant, but I enjoy them. I love their innocence, simplicity, understated elegance, low cost and unobtrusiveness in social and business situations.
If you've been involved with these pens and their history, you may be aware that the the nib unit for the 88 is compatible with the earlier Vector but NOT compatible with the later Rialto. Many sellers on ebay confuse them and advertise a pen or nib as a Rialto when in fact it is really a nib unit for the 88.
I'm now looking for a fine nib for the Rialto model. They seem pretty difficult to find even though there are a fair number of Rialtos, 88s and Vectors being sold on eBay. Most seem to come from India nowadays. Apparently, parker has licensed a company to produce them as an inexpensive product.
If you've been involved with these pens and/or have some knowledge of them, please post a comment or email me at email@example.com so we can chat. Thanks!