I searched and read a bit longer.
In this PDF by the PSS it says that only the three well-known precancels on the 20c Golden Gate were inverted (BEP). So there are no others.http://www.precancels.com/wordpress...ecancels.pdf
I was surprised when I found here some of yours, chasa, style 241:http://goscf.com/t/46945#406180
But then I understood that in the PSS style chart...http://precancels.com/wordpress/wp-...dium-res.pdf
...these aren't all BEP styles. I thought so before as I took this PDF as an opposite to the local types. But only the first types (page 3) are bureau plates, the others aren't. I also have the PSS bureau catalogue of 2007 and wondered why there are only these first types but not all the others listed in the style PDF. Now I know.
The "reading up" or "down" question I can also answer by myself, as I think the reading up is just "inverted", and "inverted" does not exist at BEP with the mentioned exceptions.
But of course I still have a question which is now a bit different.
- there are nearly no BEP inverts - ok.
- there are many inverts on local precancels - ok.
- but: are there also inverts on the styles 101 - 906 (see style PDF), or only on the "L"-locals?