Can youy please help me identifing a P51 cap?

The cap says Parker near the Lip and it says R Silver in the oposit side of the lip.
The clip is a golden one ( i thikn it is a short arrow clip Like in the first vacumatics. The jewel is Black.
This are the fotos. Sorry for the bad quality of them.
The padron of the line cap are 5 non paralel lines and them a space fallowed by another 5 non paralel lines araoud the cap ||||| ||||| (Near the lip this lines seam to be paralel).

I think this clip and jewel are not correct . I do not know of any black jewel that came from origin. And in the top of the cap where the clip fits it seems to have a horizontal mark all arroud the top cap that seams to indicat a past presence of a clip whith a larger diameter.

In the barrel ( dove grey) it says “Parker 51”
REG. T.M.640244
MADE IN ENGLAND

The pen is vacumatic whith black plastic Plunger.

My questions are

Is this cap rare? Is it all silver, and what does the R stands for?
Is the clip and jewel wrigth for the rest of the pen?

Sorry for my english, but i tis not my native language.

Kind regards

You seem to have got a rolled silver (R Silver) cap. I have one almost identical to yours.
The jewel in mine is very dark green, in most lights it looks black, but in sunlight there is a tinge of green.
Inside mine is a 4 finger grip like on the P61.
The clip on mine is gold filled too.

I think they are correct.

Regards

Richard.

Hi!...
To me it looks ok, only the jewel I think is a replacement from
a Vacumatic.... don't know whether they fit..
Experts here should be able to help you out.

These caps I have seen in English aeros.. I think they
are less common. You should see the excellent site
www.parker51.com. It has all the infos about a '51'
you may need.

R silver means rolled solver. English caps had that
rolles gold/silver inscription. USA made caps had
Gold Filled inscription.

Take care.

Only Ernesto doesn't show caps like these - despite having photos of 30-40 cap types.

Regards

Richard.