This FL5 seems to date between the two versions owned by Pete Sav as it shares some common characteristics with both. It has, as has Pet’s older one, a tall control boss on the tank, a long spindle on the control and the older, sprung brass catch on the door. On the other hand, like the newer version, it has two air tubes and a threaded cup holding the non-return valve in place. It is missing its cowl in the photo, but it has since been replaced.