Vintage Horse bit and bridle SB makers mark made in england pistol

I don't know much about this item. I was told the bit was nickel and that it was old. I'm just being honest. Hopefully, if you choose to buy this, you are already well informed. Base my price on similar bits that sold in past years on other auction sites. The leather isn't perfect. Please view all photos. I will carefully wrap and ship this in a box. Thank you.