Took delivery of 3 pens today got from ebay. I only bid because of the conway stewart pen, need advice

Advertised as a conway irredescent, very small 4 1/2" capped, beautiful irredescent red colour, imprint on barrel Conway Stewart 570 then below that holder foreign

. Theres no CS symbol on the clip and the lever is plain and straight, is this right?? The nib looks very broad and is a 14ct CS. What have i got????