I'm a bit puzzled about AppleScript 10.8.3 and Mac OS 9 but maybe, it was 9.3 which - according to French Wikipedia - was delivered with iMac DV
MacOS 7.+ 1.0 1991/05
MacOS 7.5 1.0 1995/03
MacOS 7.5.5 1.1.1
MacOS 8.0 1.1.2 1997/07
MacOS 8.5 1.3.2 1998/10
MacOS 8.5.1 1.3.4
MacOS 8.6 1.3.7
MacOS 9.0 1.4.0 1999/10
MacOS 9.0.4 1.4.3
MacOS 9.1 1.5.5
MacOS 9.1 1.6 2001/03
MacOS 9.2.1 1.6
MacOS 9.2.2 1.7 2001/09
MacOS 9.3 1.8.3 ????
Cheetah 10.0 1.6 2001/03
Puma 10.1 1.7 2001/09
Puma 10.1.1 1.7
Puma 10.1.2 1.8.1 (no OS 9 ver.)
Puma 10.1 & higher 1.8.3
Jaguar 10.2 1.9.0 2002/08
Jaguar 10.2.3 1.9.1
Panther 10.3 1.9.2 2003/10
Panther 10.3.2 1.9.3
Tiger 10.4 1.10 2005/04
Tiger 10.4.2 1.10
Tiger 10.4.3 1.10.3
Leopard 10.5 2.0 2007/10
Snow Leopard 10.6 2.1 2009/08
Snow Leopard 10.6.8 (final release) 2.1.2
Lion 10.7 2.2 2011/07
Lion 10.7.5 (final release) 2.2.1
Mountain Lion 10.8 2.2.x 2012/07
Mountain Lion 10.8.5 (final release) 2.2.4
Mavericks 10.9 2.3 2013/10
Mavericks 10.9.2 2.3.1
Mavericks 10.9.5 (final release) 2.3.2
Yosemite 10.10 2.4 2014/10
Yosemite 10.10.5 (final release) 2.4
El Capitan 10.11+ 2.5 2015/06
Sierra 10.12+ 2.5 2016/06