It is a fairly good representation of the Sig 225, (a little longer in the dust cover towards the muzzle).
It was made by Umarex but branded 'RWS C225' or 'Reck Police' for marketing purposes when initially released. It is no longer in production but does appear on the second hand market regularly.
It shoots really well but does have quite a heavy trigger in double action, it's much lighter when fired in single action mode. The decocking lever actually works just like the original. Like the CP88 there was a longer barrel and compensator version available too, called the C225 target. It was available in both nickle and matt black finishes. They also made a 'Trophy' version which came with a red dot sight and mount.
I am very happy with mine and am on the lookout for wooden grips.