In his pre-poppy, pre-narcissistic days HC used to write some interesting stuff about electronic watches.
http://forum.tz-uk.com/showthread.ph...4-watch-repair
I like my black plastic TI. The scratch isn't that bad, the light was just picking it out. An Ebay purchase from Argentina many years ago.
Looks like a few specialists around.
https://pulsarledtime.com/About-US.html