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I hope to do police for the years 1898, 1918, 1938, 1958, 1978, and 1998. These figures should work for at least 1918, 1958, and 1978 in some cities. I may do some head swaps to make them usable for 1898 by giving them a French Style helmet as it is known in police circles. It is essentially the pith helmet used by the British in the Zulu Wars; at least that's close enough in this scale.
By 1978 many agencies were no longer wearing hats so again, head swaps to figures without headgear.
By 1998, baseball caps were often the fashion. Also by 1998 few agencies used revolvers anymore and many had often AR-15 / M-16 style rifles on patrol which supplements or replaced the shotgun.
All of these should be easy conversions or require using other figures with these guys supplementing them.