there is a poster on here who collects old cap guns and his moniker is Creskol. Hopefully he will see this post and give you all the info. as far as cleaning it that is up to you. unless it came from salty air, I would personally leave it as it. but if it is a little 'flaky' you can give it a wire brushing to get it all off. if it came from somewhere near the beach it will likely have salt in it and will likely fall apart over time. to prevent this you would need to run it through electrolysis. or have someone do it for you. A lot of people on this forum do electrolysis and your small item should be easy to run. I run electrolysis on Civil War iron I find because if I don't they will crumble due to the salt. if you decide you want this you can send it to me and I will do it for you and mail it back to you at no charge. it should not take long to do. if it is run through electrolysis it will alter it dramatically. it will look closer to the day it was made but will show the pitting, etc. but once altered you can't go back. it is up to you. tell him congrats. Nice find. others will likely chime in on this and give their opinion.