Firstly the size - it often happens there's more information on the pages with original language so it may be useful to peak and compare.
I noticed the three different sizes are not mentioned in designlasi's English page of this design. They were produced in 85, 100 and 135 mm so yours would be the smallest.
Since they were hand made the size is not always accurate.
What comes to the thickness and finish they seem to vary too. There are 3 different design numbers which may mean differences in the way they were made.
Some have a flared rim and others cut and polished. Some are thicker than others and the difference is easy to see from the top.
Also some exported models may have been different from the original.