This is the source code of the Oberon System 3 Release 2.3.7 Alpha in plain ISO 8859-1 UTF-8 text files.
Downloaded from https://sourceforge.net/projects/nativeoberon/files/nativeoberon/Native%20Oberon%202.3.7%20Alpha/NativeOberon2.3.7.tar.gz/download Accessed 9.9.2023
The version is nowhere mentioned in the source code or readme; instead, Kernel.version is set to "PC Native 05.01.2003". The version "2.3.7" can only be deduced from the filename of the archive.
https://en.wikipedia.org/wiki/Oberon_(operating_system)#Native_Oberon says "The latest available version was 2.3.7. It is dated 5. January 2003 and sometimes also labeled as Update/Alpha, especially on the ftp-server of ETHZ."
Verfied that the source files are byte-identical to the ones provided at https://github.com/pcayuela/oldftpETHZOberon/tree/master/System3/Native/Update/Alpha.
All 407 *.Mod files in Source1-3.zip (up to one older) have a modification date of 2003-01-05.