Thanks to all for the info to add to the database. I have found several variations of the mark "S.L.Pol." and plan to post some information on them in the future.
Howard, does yours really have the number "1" in the mark or is it the letter "l"? I'd be quite surprised if it is a number. The extra period seems to be just one more variation on the theme. If you would post a photo of your grip strap mark, I would appreciate it.
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