I bought a Damson tree a few years back. It produces masses of small
damsons in most years. They are round all around like a marble and
about 18mm dia. The skin is very dark purple and the flesh is
yellowish with a very sweet flavour when ripe.

I always thought it was a 'Merryweather', but now I have checked and
the fruit is too small.

Or at least I think it is.

But what can the variety be ??