Rickman Frame Question ???

[AL]

Just looking at the other Rickman Freestylers, in the Museum section 

 http://www.radbmx.co.uk/forum/index.php'topic=13148.0

Just noticed  my bike is the only one with a Cross brace , from seat tube to down tube   

Any Idea , why that is    Does  it make it  newer /older than the others ??      I bought the frame NOS, with the forks , and a still has original  PAPER  warning stickers on it, so i assume its all original ..


Go on tell me its a One off, and worth   Millions