No date but the address given on the back is 146 Minories, to which the firm moved in 1958. The room seems too old-fashioned for the modern-looking Shipping Federation House which was at this address. Therefore possibly the photograph was taken at the previous Minories address, 136-138 Minories.
D F Munn is the Dennis Munn whom Robin Mills knew at the firm, and whom he mentions as blocking, together with Bill Pretlove, a very underhand deal which Peter Mack was trying to do with the sale of Mashonaland Tobacco (see Robin Mills's notes on his brother-in-law).
A Mrs D F Munn attended RJ Mack's funeral in 1955.
