Gregory: Indeed 1987 (second half iirc) They stopped around 2003, but the script is always available on request.
Most older instruments with script got them while under repair/being modified at the mothership I think, I added the ones on mine myself (on the '79 SI and '83 Spoiler)
A friend of mine has a Jeweler shop and some high tech 3d scanning/printing equipment, so it was pretty easy for him to replicate them in Silver and Brass. :-) (Brass should have been bronze I think, that one is a bit too goldish yellow compared to the logo)