Rocket three numbers?

[Tav]

Hi all. So today I've discovered that my frame and engine numbers do not match. They are about a month different. So my question is this. Could it have been built like that?? Or has it been swapped later. I'm gutted. Any help most welcome   

[Tav]

Ps the machine is 1970.

[JulianS]

I would suggest that you apply for a BSAOC dating certificate which would tell you exactly what you have.

Which part of your numbers differ? The prefix letters, the following 5 figure including leading zero or zeros production number or the model suffix?

Generally both numbers would have read the same when the bike left the factory.