Surplus 303 Ammo Question

[arrowup42]

A local auction has 600 rounds of 303 in a wooden case going up for sale tomorrow. I called and the lady said the markings on the case were ASL 1950 303 BBR. I looked around online but haven't found anything about ammo marked "ASL". Is anyone familiar with the markings?

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[David TS]

I believe you will find this is made by Aerators Systems Ltd, Sutton, Surrey, UK