During a cleanup in my basement, I found this star to fit my grand cross The reverse is marked "Rudolf Souval Wien" The star measures 55.5 mm.
In this article you previously have linkt to: http://koti.mbnet.fi/arisaka/A%20col...20Part%20I.pdf is Rudolf Souval not a known manufacturer and both my grand cross and breast star, measuring 0.5 mm. too much. To my knowledge, there have not been problems with copies of this particular order. Hope is not the case!
I also found out that my sash is wrong. It fits to the Grand Cross of the Greek "order of the redeemer" Here is a picture of how it should look like, i think:http://www.jkmilitaria.com/Rom/Rom-72.JPG
I decided not to repair the order but I will do much to get the appropriate sash as the picture above. Thanks again for your help Frayer.