I have heard that the 8-9-10 trivets were Lodge.
I have an unmarked 207 trivet with raised numbers instead of embossed. I do not know the age of it, except that it came in a 9 Slant ERIE DO.
Regarding the lid, I would expect the matched set to have a Slant ERIE mark, such as the one for the mis-marked GIRSWOLD 9 DO cover. When I have gotten 9 Slant ERIE DOs with covers, the covers have either been marked Slant ERIE, or a complete unquestionable mismatch.
I always thought the PN-only covers were ERIE covers, ie, before the logo trademark. I have also heard here that lids could be mis-matched from the factory, but nonetheless, I would consider a perfectly-matched 9 DO Slant ERIE oven and cover to both have the logo.
Still a nice DO, even if the cover is "plain."