In 1935 the last Delta aircraft built by Northrop was supplied as a part assembled pattern to Canadian
                                       Vickers in Canada.  From this, 19 aircraft built wholly by Canadian Vickers were delivered to the
                                       RCAF, the last being handed over in 1940.    They were used mainly as photographic survey aircraft
                                       in the far frozen north.  The above shot comes (via Australia's CAHS) from the Len Dobbin collection. 
                                       Len spent some time in Canada in the early stages of WW II.   RCAF 670 was written off in an accident
                                       at Discovery Passage, BC on 8 August 1942.