I was trying to find a datasheet for the SW45K 219b-v1 and ended up on this site, which has a lot of deleted datasheets for old LEDs like the 219b, and some that are even older. I’m in the process of uploading the interesting ones to the wayback machine and internet archive.
This is the 219B R9080 datasheet: http://archive.fairchip.com/pdf/Nichia/NCSL219B-V1.pdf
It also has a very early revision 219C datasheet: http://archive.fairchip.com/pdf/Nichia/NVSW219C.pdf