Glenn.
I have had a look at this and I agree that the registration should be 2057, with the cn as 2015357 as confirmed by several sources.
I also think it would be worthwhile adding a comment to the profile to explain the significance of the airframe.
For example, from Airliners.net
This is possibly the most valuable MiG-15 ever produced, certainly from an US perspective. During the Korean War the US tried unsuccessfully to obtain a 'Fagot' for technical and evaluation puposes but this example landed at Kimpo AB, South Korea by defecting pilot No Kum-Sok. Subsequently test flown and evaluated an offer to North Korea to hand back the plane to it's 'righful owners' was rebuffed and so instead it went on display at the National Museum of the USAF at Dayton.
I will tidy up into a single profile.
Malcolm.