Charles I shilling help

Hello everyone, I have this Charles I shilling and was looking for help identifying the year and possibly which mint it was produced at. Also its value !
Thanks in advance.

http://www.ebay.co.uk/itm/Silver-Shilling-Charles-I-Spink-2789-VF-with-nice-portrait-Group-D-Type-3-1-/221154434571?pt=UK_Coins_BritishHammered_RL&hash=item337dd4de0b

   That coin is similar. Asking for £250 and on top of both sides it has a portcullis like yours, so is Tower mint. Also like yours on reverse has C R either side of shield. Reference Spink 2789

That's good news, obviously not as good a grade but now I have better information. Many thanks ZacUK

  I found another place that agrees with above S# 2789 (not sure of KM# reference).

 Shilling (1632-1634)

Obverse Crowned and bearded bust of Charles I left, XII behind head, double arched crown,
 Group D, fourth bust, type 3.1, falling lace collar and inner circles
CAROLVS D G MAG BRIT FR ET HI REX

Reverse Oval garnished shield with arms (lion, fleur de lis, harp);
 mintmark portcullis, C R to sides
CHRISTO AVSPICE REGNO

   So year range of mintage known (though year not shown) as well as the lettering.
Assuming that is what yours is.  

i'll try and get some better pictures.

hopefully better pictures.

Lovely coin Tony :-)

Damned that's beautiful.

It is a beauty!