It appears it will have been made between 1946 and 1949, when the brothers parted, and Peter and his father James started the Dalesman brand as Aspindale and Son.
![Image](http://i60.tinypic.com/2igdc7a.jpg)
The above letter is from the now mostly retired Peter Aspindale and was sent to Barry Arbury who put it up on a recent auction on eBay. Wish he'd put the other side up too......