There is no need for a special tool to dismantle or reassemble any Bridgestone fork. The oil seal holder at the top of the lower leg simply unscrews and the leg will lift straight out. The seal may, however, be pretty tight after 40 -odd years.
If your bike is a 100 Sport (pressed steel frame) you will find the seal holder is made from chrome steel. You can grip the seal holder in a vice (but not too tight or you can distort it). Then I put a front wheel spindle through the hole in the bottom leg and tap it in the appropriate direction to unscrew the leg from the seal holder. The thread is a conventional right had thread, but very fine pitch. If the holder turns in the vice, tweak the vice a bit tighter and try again. the seal holder should come unscrewed with a little patience.
If your bike is a tubular framed model, the forks are different, but come apart in the same manner. On these forks, however, the seal holder is made from soft aluminium and it is easy to crush and distort if you go too mad with the vice. If you are careful, though, the fork should still come apart without problem.
If you get no luck with this method, try your local bike mechanic. There are tools for stripping modern forks which clamp around the seal holder with a tommy bar handle to give better purchase. For the numebr of times you are gioing to strip forks, it.s probably not worth an individual buying one of these tools, though.
Grahan