I confess
Mainly the UK, Australia, PNG, and Antartica
I focused at Europe and the Commonwealth
But as I continued, during my secondary school years, the collection of my grandfather and father, I did not mind adding from other countries as well.
It was during my secundary school years my main source of pocket money. Buying and selling collections of post stamps at the saturday Amsterdam post stamps market, and taking out some stamps for myself, but not too much in order to keep my working stock big enough to continue trading and cream off enough pocket money.