Looks very good condition, not sure about s/h value, but should sell quickly at right price. 2/3rds of new price is normally well received, if you still had a receipt of purchase it would help obviously. Not sure if Socom gear are still going.
Basically an old school WE 1911, they sold for about £100 -£120, I used to have one. Does it have trademarks can’t see them. IF it has get better pics, won’t add to value but may help sell faster. Used I’d say £80.