[r-t] Double Grandsire Doubles

[Simon Humphrey]

An old friend of mine alleges that many years ago I gave him some extents of
Double Grandsire Doubles.

Even if this is true, I've no record or recollection of what the callings
were.

Are there any extant extents in this method, using normal and/or reverse
Grandsire bobs and singles?  Or even 240's?  I'm aware of Don Morrison's
480's.

SH

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