Odd, Not or rarity?

[RJW NZ]

I finally found a windage arm that appears not to have been installed, there's no serial number/s and no wearing marks at the pivot etc. Top side has D.P. at the pin, and underside has a small but clear broad arrow EFD. Its so tight,clean and with sharp edges on everything that I'd easily say its NOS.
I want it for a project rifle but not with that black top side, and then it occurs to me that I've never ever seen an all black sight arm on a no1mk3. The blacking is high quality, thick and has quite a rich gloss in places. The only place I've seen similar is on good parker hales that have been refinished and on the trials rifles, no1mk6 and no1 mkV.

Before I take that black top off, is there any chance I've got some irreplaceable part that needs preserving?
Anyone know what EFD enfields might have had an all black sight?
Just being cautious, enfields=never say never ....

Information

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[Thunderbox]

Probably a salvaged windage head mated up with a new ramp, then blacked.

I don't think any No1 sight ramps were blacked from new, but you certainly find them that way on FTR'd and sportered rifles.

[Buntlineguy]

Don't lose the small spring piece as you take it apart. THEY ARE IMPOSSIBLE TO FIND. I spent 2 days with a magnet finding mine after dropping it on the carpet. When you look at the bottom of the sight you will see the small groove where the spring fits. Slow and careful. My no1 mk3 was all black, but I have no idea where it has been in the past.
B

[Eoin Mac Ruari]

Any formerly polished sight that was on a rifle that went through the blackening plant in a Base Workshop, you're lucky that it wasn't pinned.
I can never remember any one bothering to polish them again although the troops often did when the rifles were re-issued.

[Peter Laidler]

On ours, we phosphated them then laid them on their face when they went through the paint booth so that the sight was black but the face, a deep grey