It is an s suffix. Places the pistol manufacture likely in 1928, or possibly very late 1927. The barrel has been replaced while in police service, no c/N commercial proof. This would have been done at a police armory during the general police conversion from 7,65mm to 9mm. The tiny eagle is most likely a power proof after rebarreling. I do not have any concern about the sear/safety bar renumberings. Commercial pistols were numbered in standard "hidden" locations; the facing numbers were most likely added at a police armory after repair or replacement.
--Dwight
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