I watched Key Largo (1948) and Bogie whipped out a lighter around 20 minutes in to lite a cigarette for the 100+ year old Native American Indian lady, despite using a match earlier. It appears to be a flat Zippo (silver?), but it seems to have some vertical lines on it.
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Not to dig up old parts of this post from a couple years ago, but I watched Key Largo yesterday and found the scene described here...
The lighter in question is a "Park Sherman", shown here: