frame and engine numbers

Kalle250cc

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Dec 2025
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Hello! I have a featherbed frame with number X1850X stamped on headstock. I think it is a Dunstall Lowboy but would like to get it confirmed.
 
Sorry, but I can’t stop myself from pointing out (for the gezillionth time) , that Doug Hele’s domiracer frame was just called the “domiracer” frame. The “lowboy” frame was quite different and from an earlier, experimental Manx.
 
I have traced the owner back from the mid 70ies. He experimented with his own rubber mount and headstay. He made a JPS copy on the fairings.
frame and engine numbers
 

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