It's a Esterbrook SJ Double jewel in Dawn Gray, 9556 nib. Looks great, so petite! There are some gorgeous photos of beautifully restored pearl blue and brown Esties on this site, they always make me drool!
As I carefully opened it, I found that the sac is soft and pliable. I read on this site that some tempt fate and use their original sacs, should I take the chance? If not, could someone point me in the right direction to buy a new one?
I do need to thank Brian A. and Richard for their great sites, with their help I was able to ID my pen!!! Once it's looking spiffy I'll post photos.