It is a pre-Victory, made for the British. That gun was made before July, 1941; the checkered grips and blue finish would be correct for that period.
If it has the US property mark, it is definitely Lend-Lease, but I don't think that marking had gone into effect yet, even though the L-L Act was signed in March, 1941. The Victory model came into being later when S&W went to 999,999 and then started with V 1 (4/24/42).
Are there any British markings, such as acceptance markings or proof markings?
Anyway, if it is in good original condition, it is a desireable collector's item.
Jim