Thanks Dan.
Yeah, I picked this one out because of its bamboo tiger theme. I couldn't find anything I liked as much as this one on aoi Japan, nihonto.us, and about a dozen other sites more reputable than ebay. This one is gonna blend well the the fuchi kashira I received as a gift a few years ago (also bamboo tiger theme). Now I just need to find some menuki, then I'll send it all off to someone to take care of the tsukamaki and the saya (probably fred lohman, but that's not set in stone). Still deciding on the ito, sageo and saya color scheme. There's no rush. That's the great thing about shirasaya. I'll figure it out when I figure it out and the blade isn't going anywhere.
However, I am now considering removing the lacquer on this tsuba. If it's not an antique, as Mr. Hallam says, then I see no big deal in tinkering with it. If I can get some patina in the mix, a copper tsuba would be even better than an iron one in this case.