Tha placement of the small pen blade and the nail pulls on two bladed jacks is actually an interseting thing if one studies older slipjoints.
Case is one of a very few companies that traditionally put the small pen blade in the BACK on their two bladed jack patterns...though they never did it 100% they did it on most knives. Other companies that did it this way at least on their older knives include Queen and KABAR.
MOST companies (Schrade, Camillus, Utica, Ulster, Reminton, and most others) would put the pen blade in front of the master blade.
Oddly enough, the only Case pattern that I know of that was 100% opposite the norm (pen blade in front) was the 6217, which was the forerunner in effect to the new swayback jack.
You will see some examples of 60's era Case barlows and 35 pattern jacks with the pen blades in the front as well, though they did these both ways.
I agree with other posters, the new swayback blade design would preclude the pen going in front.