I haven't been able to find a reference that I can prove to be credible, but I did find this information on the internet.
http://www.wwiiequipment.com/index....e-second-world-war&catid=47:british&Itemid=59
[FONT=arial,helvetica,sans-serif]Around October 1940 Captain Hawkins submitted a design for a hand-thrown Anti-Tank mine. It would be thrown in the path of oncoming tanks and contained 2.5lb of explosive which would detonate on crushing. [/FONT][FONT=arial,helvetica,sans-serif]By May 1941 arrangements were made to produce 100 of the grenades for extensive trails, 50 would be dummy and 50 would be live, these were ready at the beginning of June, trials of these these were successful. After these trails the General Staff decided to place an order for 2.5 million Hawkins grenades.
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No.75 statistics[FONT=arial,helvetica,sans-serif]
Height[/FONT] [FONT=arial,helvetica,sans-serif]1.875in (4.76cm)[/FONT] [FONT=arial,helvetica,sans-serif]
Length[/FONT] [FONT=arial,helvetica,sans-serif]6.5in (16.51cm)[/FONT] [FONT=arial,helvetica,sans-serif]
Width[/FONT] [FONT=arial,helvetica,sans-serif]3.625in (9.2cm)[/FONT] [FONT=arial,helvetica,sans-serif]
Total Weight[/FONT] [FONT=arial,helvetica,sans-serif]3lb (1.36kg)[/FONT]
[FONT=arial,helvetica,sans-serif]Explosive Weight[/FONT] [FONT=arial,helvetica,sans-serif]1.5lb (0.68kg)[/FONT] [FONT=arial,helvetica,sans-serif]
Explosive Type[/FONT] [FONT=arial,helvetica,sans-serif]Ammonal[/FONT] [FONT=arial,helvetica,sans-serif]
Material[/FONT] [FONT=arial,helvetica,sans-serif]Steel[/FONT] [FONT=arial,helvetica,sans-serif]
Pressure required[/FONT] [FONT=arial,helvetica,sans-serif]10lb (4.54kg)
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[FONT=arial,helvetica,sans-serif]Production of Hawkins Grenades by year (UK only, Filled only)[/FONT]
[FONT=arial,helvetica,sans-serif]1941[/FONT] - 242,000
[FONT=arial,helvetica,sans-serif]1942 - 6,537,000[/FONT] [FONT=arial,helvetica,sans-serif]
1943 - 4,093,000[/FONT] [FONT=arial,helvetica,sans-serif]
1944 - 333,000[/FONT] [FONT=arial,helvetica,sans-serif]
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Unfortunately, I cannot find any other sources that mention the 242,000 produced in 1941.