I am (for my sins) a stamp collector.
When I look at your stamp listings I can select new or unused. Which do I select if I only want MNH (Mint Never Hinged)? Some sellers could list these as new, others as unused, and to go through two massive listings such as these is quote frankly bordering on the impossible.
Also when I look at France for example, I am only able to lok at France and Colonies, and as most stamps in the list are Colonies I am faced with over 200 pages to look for, which is again impracticable.
Again, there is no way of reducing the selected stamps to particular year of issue, which again makes the search tedious to the extreme.
More filters are needed urgently if I am going to visit your site again.
Please notify me when (or if) you are going to install them. Until then, goodbye.