I really shouldn't be doing this, as I don't 
want to get in trouble, but I have to completely 
dis-agree.  Quality has VERY MUCH to do with 
Opening Cel value.  I have yet to see a show 
that doesn't have more detailed and better 
produced cels in the OP.  And I Definitely have 
yet to see a show with worse cels in the OP.

And as stated already, the series Rurouni 
Kenshin has VERY beautiful OP cels, while most 
of the series is 'ok' to 'good' quality.  Only 
from the mid 40's to mid 60's in episode numbers 
does the quality match the OP.  This is of 
course, to the exception where they got lazy and 
simply borrowed cels that are previously in the 
show.

The key word there is borrowed.  They are normal 
production cels.  To say that they are OP cels 
simply because they are re-shown... If you've 
seen Fushigi Yugi, think about this.  The ending 
is simply moments from the episode show again.  
If that's the case, and it is, would that mean 
that 3 to 4 minutes of every FY episode is made 
of Ending cels?  NO!  No way!

I don't want to be a jerk, but I almost think 
it's crazy to think normal production cels shown 
in the show first; created for that purpose, to 
be part of the show, between the OP and ED, are 
the same as cels that were created to be used in 
the OP and ED originally.

Just so you know, I also think the reverse would 
be true.  If a cel was used in an Ending credit 
of a show, and then a very similar scene was 
going to happen later in the show, so they just 
used the same cels... they would be considered 
OP cels.  See what I mean?  Anyway, please 
nobody hate me.  Especially the seller of the 
cel in question.  I actually think it's quite a 
nice cel, and would be bidding if I had more 
money right now.