I don't know but if you want to check on some specific possibilities, I would think

S.........J.........P.L.R

O&C or....JRM.......CHJ
D&C

As for the first chip, I have a feeling we are not looking at 2 letters overlayed on eachother. I think I have seen similar cheracters in Calligraphy, On diplomas, certificates, invitations. You might find some samples in a Calligraphy Book that will help. The first, second, third and sixth chips seem to me that they may have some origins there. The other two I don't know but where ever you find one, the other, I think, looks like the same style.