Posting a couple more of Dick Celler's stamps that I obtained last year.
Position 100R2 is a really interesting plate position. It is a bottom-row (misplaced) A relief.
We had a discussion on it here, previously - http://goscf.com/t/58151#508483
Here are two copies of it that Dick had. Note the 11th row effect, where you can see the top of the B relief in the bottom margin, from the over-rocking of the transfer roll. It is very visible on the pen-cancelled stamp. The stamp with the New York CDS, is ex-Wagshal, and was lot 940 in his Siegel sale 994.