The 1979 Holsten Lager International was a non-ranking snooker tournament held on one occasion in January 1979 in Slough, England.

The quarter final between John Spencer and Cliff Thorburn is how the event is best remembered.

In the afternoon session, Spencer made the first ever 147 in a professional tournament.

As it was the afternoon, the TV cameras were not running and the pockets were not measured to check conformity, so the break was never officially ratified for record purposes.

Spencer went on to beat Graham Miles 11–7 in the final.