hi st55 usually is a custom colour st50 normal colours last 5 in model is for non standard colours i have seen quite a few of that coulour of blue, but with a 62 type neck , but none of them had stickers on the back, they are taken off quite often, but something is wrong ,either the pickguard has been changed to the 60's type, or neck has been changed.take the pickguard of and check for any redrilled screw holes.cause that pickguard is a 60,s type and the neck is a50's.a single ply pickguard has only 8 screw holes which would be on a 50, replica. so if the body has only 11 screw holes that would indicate that tokai neck has been put on the body. but if there are extra holes then it is probably that it is just the pickguard has been changed, hope that helps