Hi Guys, Alas I am sorry to say this time it is not a rare saw, it is rather a common saw, I would say modern, but I suppose, it is not that modern, being that it is almost 100 years now that it has been made. I suppose there are going to be changes over the years, as working practices and materials change. The No 52 has changed little other than the handle, it seems to have evolved over the years. My observation is the type of steel used. In the very first No52 saws the steel was Mermaid brand, I am guessing but were there more than one variety of mermaid brand, Extra & Extra Extra, I am guessing here, I am sure I have seen some thing close. Then a little later on the No52 started to appear in Leap Frog Brand. Last but by no means least, the picture here is of what looks to be a saw of modest age, now the other more modern style of handle has been around since the 1960's , I wonder if anyone fancies a shot at its age, the handle could be a lot newer than 1960, I suppose it might of been a special lot made to order so to speak. Finally the steel in this saw is London Spring. I wonder if that is common practice, use different steels as the years go by.