Jony,
Quote:
mint Australia from the last 20 years or so
Can you be more specific please?
If, from Year 2000 onwards, you may have a significant value, I am looking for stock in that era.
Opinion:
If you were in Oz, let's say a ball park of 60%-75% of face.
As you have to cover UK postage, deduct that.
If you have late mini sheets etc, I would tend to market in lots via
ebay, that stuff is not readily available, however a big caveat, I see stock being offered at this price but, not aware of sales price.
If it is 1960's to 1980's mint always sells, but if used, it will be very difficult to move at any price.
I have a bid on at the moment in US, for 5 years of "this and that" mixed Aust, no sets, just hinged randomly, poss a starter collector. 70's to mid 1980's currently at $5
Faces of Australia (2000) is a valuable sheet
"International postage" (with blue band) stamps are sought after
My advice would be to scroll through Scott pages, you can pick out the more valuable quite easily.
Consider making "year sets" that may get you a premium.