Dating Claud Butler bikes by lettering?

Ajoten

Old School Hero
Is it possible to work out the age of a CB frame from the type of lettering on the down tube? I think there were copyright faffings when Holdsworth bought the company, but am trying to find out if a particularly frame for sale is older than me!

[Because frankly I'm not prepared to consider post-1970 as "vintage" :( ]

It's got large sans-serif block capitals in the style of
Claud-Butler-taper-tube.jpg
and Nervex lugs so I'm hopeful, but unlike this one it's rather tatty and obviously lack of care suggests a cheaper suggests a younger model.
 
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