Hi mate. The sights are quite rare, so rare in fact it might be very difficult to put a value on them. One point I have to mention, I have seen a short discussion about these before and it was unsure as to what the material was in the sight.. Age would suggest radium. This stuff is highly dangerous, like early glow in the dark watch faces and compasses. At the very least we need to determine somehow what they were made of and if there is a danger present. I will go through the List of Changes later this evening and see what I can find out. In the meantime if anyone reading this has any input, please chime in.



I have confirmed in TLE that if they are "Sights, Luminous, No. 1 Mk. 1 fo0r R.S.M.L.E. MarkIII." then the sight is, (by the description) "Rendered luminous by a Radium compound"



Here's a quick copy- paste from wiki



"Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen on exposure to air, forming a black surface layer. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226, which has a half-life of 1600 years and decays into radon gas. When radium decays, ionizing radiation is a product, which can excite fluorescent chemicals and cause radioluminescence.



Radium, in the form of radium chloride, was discovered by Marie Curie and Pierre Curie in 1898. They extracted the radium compound from uraninite and published the discovery at the French Academy of Sciences five days later. Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne through the electrolysis of radium chloride in 1910.



In nature, radium is found in uranium and thorium ores in trace amounts as small as a seventh of a gram per ton of uraninite. Radium is not necessary for living organisms, and adverse health effects are likely when it is incorporated into biochemical processes because of its radioactivity and chemical reactivity. Currently, other than its use in nuclear medicine, radium has no commercial applications; formerly, it was used as a radioactive source for radioluminescent devices and also in radioactive quackery for its supposed curative powers. Today, these former applications are no longer in vogue because radium's toxicity has since become known, and less dangerous isotopes are used instead in radioluminescent devices."