Weston Master exposure meter

This was my father's exposure meter. It still works, although at some stage it was dropped (not guilty), so you may be able to see that there is some Sellotape over a crack in one corner (I think the casing in those days was bakelite, which was more susceptible to cracks than modern plastics). I think the film setting used a Weston setting which was not quite the same as ASA. Later in life my father bought a newer Weston, a Euromaster I think (I'll get it out and photograph it in due course), and I also had a Weston at one time.