This Saxony 1 Mark 1921 is far from rare. NZ$30 is way too high for it. Last year I sold 1 Mark for 9 Euro.
You could buy from me the highest denomination (20 Mark) and the most expensive coin from this set for 14 Euro. http://avscoins.com/en/coin/4245/saxony-20-mark-1921/
I collect coins and tokens which circulated in Africa from 18th century to 2000. I sell about 7000 illustrated world coins from http://www.avscoins.com.
Thanks. I just like the idea of unusual coin materials. I've got a whole lot of iron, tin, zinc, aluminium coins. I'd like to get a porcelain one sometime. I'd never seen them for sale before so I got excited to try and find one. I guess I can wait a bit longer to get one.
If you are interested in different coin materials, keep in mind that porcelain could be brown, white, red, black, even blue. Also there are encapsulated stamps, and coins out of pressed carton (last two).
I collect coins and tokens which circulated in Africa from 18th century to 2000. I sell about 7000 illustrated world coins from http://www.avscoins.com.