Tim,
Yes, actually! Today I ordered a black resin to cast the buttons from and found the appropriate brass shanks for the backs. Unfortunately since I no longer own my original rubber buttons I will not be able to replicate the markings on the back.
Here is the casting resin I am going to use:
http://www.smooth-on.com/gallery.php?galleryid=442&cPath=1325. The silicone molds will be durable enough to allow me to produce several resin button "blanks" that I can then use to make master molds containing entire sets of buttons. The shanks will be set into the back of the buttons during the curing process.
I'm working on leggings and seamless overcoats as well but I'll post photos of the buttons as soon as I can. They shouldn't be too hard to do.
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Brian WhiteWambaugh, White, & Companyhttp://www.wwandcompany.com----------------------------------
Randolph Mess, U.S. Sharpshooters