What is the correct term and use for this 'knife'?

I would imagine this to be a form of butter knife but cannot seem to find an exact replica of this. Could someone please tell me the details as asked in the topic line?

Much appreciated
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It seems this is a fish knife of sorts, confirmation anyone?

There seems to be a very fine line between butter knife and fish knife. I would guess that if you have a set of them they would be fish knives but if only one, then a butter knife. The other potential difference is that I would expect most fish knives to have flat blades and that those with curved blades, like this one, would be butter knives as the curve gives a “curl” to the butter which prevents it sticking. As I say though, it’s a fine line…

Thanks mate. I’m going to go lean towards the butter side as there are only 2 of them and both are from different years in the 1800’s.
Much appreciated for the information supplied.