By the preponderance of evidence pointing to your example as being more likely a 1991 example, and by the seemingly over whelming opinion from other members here that your example is more likely a 1991 example, do you still believe it is a 1981 example?
I have not seen any examples with the same/identical control route milling as your example has, from the 1981 era, that also have the control routes clear coated, as your example is.
I have seen examples from the 1991 era with the control routes that have been clear coated, that also have the same control route milling.
I have not seen any examples from the 1981 era with a separate neck heel, as your example has but I have seen examples from the 1991 era with a separate neck heel.
The ground wires on 1981 era examples are usually not insulated but when you do see an example with an insulated ground wire, it should be clear insulation.
From the 1991 era examples I have seen, the ground wires that are insulated have red insulation.
Your example has a red insulated ground wire.
Tuners for 1981 era should be stamped Greco Deluxe.
The tuners on your example are not stamped Greco Deluxe.
Pickups for 1981 era, serial 1 55** should be stamped with the typical six digit stamp, which as been discussed here on several occasions, and as we know, these six digit stamps continued until the very late 1981 time frame.
The pickups in your example do not have the six digit stamp but look exactly as the very late 1980s era, to early 1990s era pickup bases look; no stamp & no sticker.
Another point of interest is the head stock face.
Every single example of a 1981 Greco EG/EGF that I have seen will have one of three things; Super Real, Super Power, or Super Sound, and in gold.
Your example has none of these.
The head stock face on your example looks exactly like a 1991 example should look.
Again, there is a much greater percent and/or preponderance of attributes that your example has that point to it being a 1991 example, and not a 1981 example.
My ?guess? is that your example is 1991 production from Kanda Shokai Corporation but that is only my guess, going by my experience, and going by my knowledge base.
I could be wrong on both points, the date, and the manufacturer.
I really do not believe I am wrong on the date; I am quite confident your example is a 1991.
There are just way too many attributes of your example that do not point to a 1981 manufacture but rather point to a 1991 manufacture.
Some of these atttributes can easily be changed, yet some cannot.
Hopefully whoever bought it will enjoy it, and won't really give a flying flip what year model it is ..............