"George Harrison pulled a couple of guitars off the wall" and eventually decided on a Fireglo (red) Rickenbacker Model 425. This description is validated by the research carried out by Mr. John Hall of Rickenbacker International Corporation which indicates that the guitar Harrison purchased, based on the serial number of BH 439, was shipped from the factory in the Fireglo finish. It has also been confirmed by Mr. Hall, that this instrument was shipped by the factory, in error, as a Model 425 even thought it was in fact a Model 420, having no vibrato. After all these years this is not the time to rewrite history, and so a Model 425 it remains to this day. The serial number would indicate that the guitar was made in August 1962. That it was "red" is of particular interest. It is well know that Harrison performed with this guitar on the "Ready Steady Go" television show hosted by Dusty Springfield on October 4, 1963, however, the instrument had been refinished to black by that time.."
http://www.rickresource.com/rrp/youwontseeme.html

Is this information correct? (color and serial number)
Thanks for help!

All of this information has been widely reported. I don't think there's any controversy here.

No controversy here as Mr. Hall says.

While George was trying the 425 out at the store he asked "...Do you have any black ones.."...the answer was no, but arrangements were made to have BH 439 oversprayed black before he took delivery of it and retuned to England.

I am a previous owner of BI 444, also a 1962 425 and still in it's Fireglo finish..possibly made in the same batch as the 425 that George ended up with, for it's only 5 numbers away in the sequence, from late August into early September 1962. John Williams owns the guitar now.