There's always some Tiffen filters like Soft FX etc, etc. But, why can't you add this desired effect in poster after the VFX has been applied? Regraining it using CineGrain, rGrain or anything that can give you an overlay for a 16mm film stock would help out a lot. This can also include diffusion and CC to give the optimal 16mm film stock look.
As for lenses, there's always the Russian Lomo lenses which creates a rich and characteristic vintage look.