12b AYA Yeoman.
Side By Side,
Double Trigger,
Non-Ejector,
28†Barrels,
Choke: Half and Full.
All in good condition. I’m looking for around £180 ono
Based in Bedfordshire but can arrange RFD to RFD.
They are dials to show the position of the reticle within the scope tube.
The "M" shows that the reticle is in the centre of the scope tube. If you twist the adjuster the black spot will move to either the right or left which shows the degree of travel from the centre of the scope tube.
Hope this helps.