Any way of valuing this real Omega rarity???

[33JS]

I'm having a clear out and moving overseas. Loads to go, and sadly this is a potential for sale. So is there anyone can give me an estimate/guesstimate as to a value?

This is a genuine Omega Boutique issued 50th Anniversary Speedmaster leather jacket with hippocampus embroidered on the rear and numbered xx of 300. The fur collar is removable! It came from the Geneva boutique back in 2007 and although it has been tried on, it has never been on for more than 5 minutes, or so much as out of the house.

Help!