Please assist in identifying these keys?

[nfalk]

I've been collecting keys for about 30 years now and I have a few that I believe are historical, but the lack of knowledge and sources to assist in identifying them just frustrates me. I've decided to go public and see if I can't get some help from pro collectors to help identify some of them. Please, please, please help me I.D. these keys (time period, usage, history, etc...) and thanks for ANY information.

I believe the keys are from a brig ship about 4-4.5 inches, then there are 2 large gate keys about 6 inches, I think an ancient roman key about 2 inches and the Seattle Police keys which is about 3 inches. I've reached out to the Seattle Police Museum for information but they never responded. Again, I'm looking for information on the time period, usage, general history around them...and a HUGE thank you for any assistance provided. I can be reached directly via email or by reply to this thread.