Is this kind of Japanese Teapot (Seishi Pewter) an Actual Thing?

[McScooter]

I've got a growing case of TAD, and have been slowly developing a wishlist of teaware, both clay and non-clay, from all over the world. I'm familiar with silver teapots and all sorts of Japanese teaware, but this is the first I've come across anything like this:



The teapot is available here:
https://www.teadealers.com/collections/ ... ter-teapot

It's apparently made of 99% tin and 1% silver. It's called (I take it) a "Seishi Teapot," and it's insanely pricey at $1,145. It's also one of the more intriguing non-clay teawares I've come across. It appears to be made by a studio called Seikado, based in Kyoto. Is this "Seishi" style of teaware prevalent in Japan at all? Google doesn't seem to yield anything, other than links to Seikado studio or the seller, and I've never seen something similar. I'd be interested if these came in gong fu sizes from other makers, and didn't feature what I assume is an insane New York City markup (though the wares on Seikado's online store aren't cheap either).