Maybe it is, maybe not but I wouldn't.
It just isn't worth it. Many of the older film falshes voltage is too high for DSLR's and will damage them instantly.
Not saying this is the case here, it might be fine, but I still would not trust one.
EB
EOS 1D, EOS 1D MK IIn, EOS 1D MK III, EOS 1Ds MK III, EOS 1D MK IV and EOS 1DX and many lenses.
