I found an RG 550 for sale for a very good price. The gentleman said it was a 90 but I am not extremely good at telling the different model years. From the images it looks like a 550 but it is missing a tonal pot and also looks like the Bridge pups have been replaced. Other than that it looks pretty good from what I can tell.
Let me know what you guys think!
Cant really tell from the Serial number what it says...