I have a lovely HW90 in what to me looks like a CS800 stock. It has a barrel longer than the current carbine with a grub screw attached Theoben Evo silencer (without the Vortex tip - if anyone has one......please!). I cannot for the life of me find a serial number on it, as I had a notion to use the WH database. on the r/h breech block there is 'Weihrauch', then Made in Germany, then Theoben, on the l/h is HW90K with the cal. .177/4.5mm and the two figurative pellets, absolutely nothing on the cylinder! Any thoughts, info welcome. Shoots absolutely beautifully at 11.6 with Webley Mosquito 7.87 grains.