[Salmo Nella]

I have a bunch of information. I'll try to be concise but my terms may not be correct.
marked as 3 1/2 " diameter
It has three straight lines of marking on the back. the top one is Hardy Bros.
I can't remember the other two (I am not at home right now) but I think the bottom line is "England".
Inside are the reel makers initials "js" (he worked there for 45 years or something)
The line guard is circular and looks to me to be nickle silver
Here are the really unusual and salient things.
The spool is solid, no vents, and has no markings on the face. It is an aluminum color but may be an alloy of some sort. The handle is white but I don't know the material.
The spool is held on by a screw which screws into the center post. The screw has finger knurls but also a straight slot.
The spool fits over the center post and rests on a raised washer like flange that fits into a recess in the spool inside the diameter of the spool gear.
There are no ball bearings.
The "break" mechanism has two triangular metal pieces that click on the gear on the back of the spool and are tensioned by flat springs which are adjusted on one side by a brass cam and thumb screw.

The museum identified similar reels as being an uncatalogued model known as "the fly reel". Seems a bit vague for a company that has names like St John, St George and Princess. The pictures weren't clear enough to know if that is what this is or not but it did not seem to match the other models.

Thanks for any help you can give me.