Frustratingly a lot of manufacturers also tend to just give the dating as "medieval", and even when they have dating it is usually not possible to do a search by century.
But then you have the web site of Armour&Castings in the Ukraine where you can search by century, and which has a lot of things from my period that I have never seen reproduced before.
Today, which was a seriously lousy day, a package from the arrived and made my day much better. It contained a buckle, some belt ornaments and this lovely brooch:
The funny thing is that I only found the original a month ago or so, here it is: Walter's Art Museum. It's from the 13th century and the letters form a prayer, namely "AGLA: Atha Gebri Leilan Adonai" ("Thou art mighty forever, O Lord"), I am of course totally ignoring this and pretend that the A is for Aleydis, the name that I use in the Society for Creative Anachronism :)
Anyway, I found it (on Pinterest of course), and exclaimed on facebook: "I want this!" And, two weeks later I found Armour&Castings while trawling the internet, and they had it. I've never seen it anywhere else.
And today it came! So yay!
And when I have money again I am so getting this belt mount. And lots of other stuff.