Actually, I have many US graded coins. Problem is this, coins from auctions in Germany/Austria/Italy/Spain/UK have a much stricter grading process then in US. For example a German graded coin EF (extra fine) would be MS 62-64, while a stempelglanz (uncirculated)would grade MS-66/67. Kinda a lot like difference in butterfly grades from one dealer to the next.
Here is an example, this Souvrano d'or from Lombardy-Venetia 1831-A Emperor Franz II of Habsburg was graded FDC by Varesi/Italy. Heritage auctions had a MS-67 in auction, mine was way better quality.