First of all welcome to the forum.
Mostly speculation on my part, but this pic was found with a google search and I did not see many examples like it.
The absolute last models of Korean Kramers before production ceased seem to have the pyramid (big 'K' to little 'R') with the truss rod cover providing the model #. The strikers no longer used smaller font near the 'Kramer' just as you've described with most older Aerostars. My guess is aerostars like the strikers just dropped the name and used numbers (w/ a letter or 2) only. Similarly, the Japanese built Focus line dropped Focus and used 'F-1000' on the truss cover towards the end. Again, the Asian lines got rid of the names and just used letter and number to differentiate models. In short, your model is likely one of the last Aerostars produced and there are likely a few out there, just one of the last to be produced and sold. My .02.
I don't usually find a use for this smiley
, but I like so there you have it.