A brass, one dog opening porthole with the initials SL embossed on the bottom left. Pretty sure this is from the makers Simpson and Lawrence who have been in the chandlery business since 1908.
Measures 23.5cm total diameter and 15cm glass diameter. I have 5 of these available.
Weigh 3.3kg each.
I have four backing rings which will go on a first come first serve basis.