I think its a VENTS MK1 or 2, we used to run with them in the early 90's and had to abandon them (they where an excellent mask) because we could not get new lenses.
Good luck finding replacements, and if you do find some I'd recommend NOT using them as they will be really old and probably well past their best.
Remember you only have one set of eyes. Do yourself a favour go buy a good modern mask and enjoy in safety.
Regards,
Niloc65
Aka Colin
Split Personalities.