Hi Vitaly. I was in the same boat myself with this one below. The difference with mine is that I didn't pay much attention to the mei and didn't even try to translate it. Actually, I thought it was by someone other than Nobuie as per the seller's posting and I sort of wish that had turned out to be the case. However, I don't regret buying it at all. I just liked the tsuba. I got an opinion from @Spartancrest as to whether or not he thought it was a period piece (sometime before Meiji) or not and then I jumped on it. He's been a great help to me and others who are beginner collectors. It was actually up for auction twice. The first time I was about to nab it for about $200USD but the seller didn't like that and pulled the auction with only 5 minutes left. A few weeks later they put it back up and I ended up spending about $300USD on it. Later in the translation thread I was trying to find out what the writing was and only then was I told that the mei was Nobuie. I guess it's possible that it was a later Nobuie that made it but even if it's a complete forgery, I still like it a lot. It looks like somebody liked it enough to mount it (or perhaps the sekigane were added to make it look that way) and then someone else had a custom box made for it. Someday I might send it through shinsa but I'm relatively sure it's a 'tribute' piece or straight up forgery.
Anyways, the one you posted and mine have a lot of similarities. The photo isn't great but I can definitely see strings of kanji carved into it. I wouldn't be surprised if the same artisan made both of them.
Good job for setting a price limit. I'm not too great at that.
Incidentally, I saw a NBTHK papered Nobuie on auction last week starting at around $23,000USD.