Did the best I could! I decided not to use chemicals for the risk of taking the whole decal with the paint, so I spent a couple of hours straining my eyes with a needle. The paint still chipped off and took some of the decal with it which is a great shame, but you still know what it is when you see it! It isn't stamped into the metal, unfortunately, otherwise I'd have filled it along with the F-1 stamping as well. The F-1 looks much better now... Sitting pretty with the rest of the collection at the moment! Again, many thanks for the comments.