Question about Keys?

[RitaPA.]

I have a question about how to date keys.I am getting quite a collection of keys.I have done research on here but have not found any way to be able to date them.A few I was able to determine by if the key company went out of business.But for most of them I have found nothing.I have been detecting on an early 1900's house and hotel.A lot of the keys are brass.Some are tubular.If anyone knows of a link that would help I would appreciate it.Thank you in advance for any ideas you may have to offer. RitaPA

 

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[metal mania]

Can I suggest you look closely at the key or better still perhaps post a pic how are the keys constructed

 

[Tank69]

97 % of keys are brass I just scrap em