Hi there Norman, we just from out the Diageo (parent company to Haig) the below:
Your Haig and Haig whisky bottle has been forwarded to me here at the Diageo Archive. Using the photographs you provided, I have dated the bottle. I agree with the consensus on the whisky.com board that the bottle is from the 1940s; in the collection we have at least one example of this bottle design in adverts from 1948. In an attempt to narrow down the date I focused on the box and checked the archives historic advertisements collection, although this only confuses the matter as the only example of the box design I could find was from December 1953. Unfortunately I am unable to find if the box design was used over a number of years or was a one off seasonal design.