Kurt, you're welcome! I'm getting another batch, seeing the spread of your batch (mine was all around 390 and one coin of Constans). Ill be ordering tonight (and telling another seller than he shall have to wait if he wants to sell me some coins..).
Keep us updated!
After cleaning mine off I found that with a very slow approach, using an angled needle, I could 'polish' each and every one. If you only polish the flan, the letters stand out and as does the bust. Good luck with yours!