Hi,
I've just come across 4 OKI MSM2114LRS which you are more than welcome to have, gratis. Just priv-mail me your address and I'll drop them in the post to you tomorrow.
I don't know their age or status, but they look unused. I was trying to find a tube that I purchased back in the late 1970's/ early 80's, and which I should still have, but I cannot find them after about 5 moves, sadly. Else I would have offered some that I know are unused!
Just let me know if you still want them.
Regards,
Sarah.