I have 2 older vintage timing lights and they are chrome. The kind that clips onto the spark plug wire lead for timing sense. They were used by my father a while ago when he had his gas station...probably at least 40 years ago. 1 is a SEARS brand and the other is unknown.... I don't know if they work...haven't tried.

$35 OBO plus shipping

PS- these might be worth alot more to a collector but I don't have the time to research these