These National Cash Registers date from the turn of the 19th century through to about 1910. They had huge run ups in value during the 1980's and peaked in the early 90's. Since then values have declined a great deal. Comparable examples to yours often sell in the $500.00- $1500 range at auction.
Re: National Cash Register
This page https://fivekatzantiques.com/categories/mercantile/ has a cash register that looks very much like yours. They have a place to click to contact them so maybe they could tell you what you have.
They have a short blog about it https://fivekatzantiques.com/april-9th-is-national-cherish-an-antique-d…
Here’s one that sold for $25 https://www.ebay.com/itm/Antique-Vintage-Brass-National-Cash-Register-M…
One on eBay https://www.ebay.com/itm/Antique-Vintage-Brass-National-Cash-Register-M…
And here’s one that sold for $400 https://www.ebay.com/itm/National-Cash-Register-Model-442-/372957228115…
I don’t know their value but hopefully knowing what you have will help.
Re: National Cash Register
These National Cash Registers date from the turn of the 19th century through to about 1910. They had huge run ups in value during the 1980's and peaked in the early 90's. Since then values have declined a great deal. Comparable examples to yours often sell in the $500.00- $1500 range at auction.