Cartridge without serial?

Rdk, you nailed it right on the head. Reviews are telling and I'll take it risk. After doing some digging I'm going ahead with purchase. 

I have serial numbers on some of my cartridges.  The Kiseki Blue NS I bought from Kron doesn't have one.  I did a Google image search and couldn't find an image of one with a serial number. 

Generally speaking, if you buy an "international" version of something, it's not going to come with a US warranty.  As long as the seller has a lot of positive reviews and you have a level of comfort that it's an authentic item, I think your risk level is relatively low.

What cartridge @j-wall ?

Chak, in one paragraph you contradicted yourself. You wrote that your ZYX aiRY III cartridge lacked a serial number, and then you also wrote that it had a fake serial number. You can’t have that both ways. Which is true? And this is the umpteenth time you have brought this up, so I gather you are really pissed off at 2Juki.

It’s not like anyone with a bona fide expensive LOMC  cartridge is going to get anything approaching a good deal when he or she goes to have it re-tipped by the manufacturer. In general the net cost is similar to that of a brand new cartridge. In fact, as you know, often what happens is they take your cartridge and send you a new one. In other words, the so-called factory warranty is essentially worthless.  People go to aftermarket retippers to save large sums of money vs having the retip or exchange done by the manufacturer. Yes, the trade-off can be altered SQ of the retipped cartridge vs the original. However, it is often the case that the customers are very happy with the results. Live and let live is my philosophy.

@big_greg thanks for the info on international sellers. I haven't ever purchased from an international seller so the lack of warranty was originally worrisome, even though their transparency off the bat was very cool. I'd be curious how often a warranty is used for cartridges? I'm sure I'm personally just used to the piece of mind when hearing the phrasing.