50-165
Need more information but there is a model 1858 ;) BUT that patent date is on different revolvers as well.
I would start my search at Numrich Gun Parts Corp.They may be found on the web.
Not possible to answer at long distance- value depends on EXACT model, EXACT condition, and originality. You need a hands-on appraisal. Sorry-
If it's a replica it's clearly market by the manufacturer if however it a forgery they could have stamped it appropriately. So no.
24 to 30gr of FFFg
there is no 1858. there is no 1958!
Remington 1858 cap & ball looks like a navy colt to me
Will probably have to be made. a good gunsmith or machinist should be able to do it.
you can get around $25
you can get around $25
Depends on condition- anywhere from $100 to $1000. Antiques like these really needs a hands on appraisal
There was no Australian currency prior to 1911. What you probably have is a traders token. There were several One Penny tokens minted in 1858 for various Melbourne traders. You may have something of value, if you can identify the token properly.