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There is a blog where someone mentioned there were 527,000-odd different stamps issued as of 2009, with an estimate of 15,000 more per year. If this is all true, then approximately 600,000 different stamps have been issued
That's my blog ;) But why stick with 2009 numbers, as I've published more up-to-date figures almost every year (you really need to read/visit my blog more often, LOL).
That said, I can give you current stats straight from the horses mouth(Michel). Their current catalogs list 718,000 major number items, and about 1,2 million varieties. If using Scott or SG or Yvert as your baseline, then the figures will likely be somewhat different.
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Clearly, this must exclude almost all varieties such as perfs, watermarks, shades, and anything that would potentially exclude a stamp from being "different" in terms of design, color, and denomination (e.g. stamps given "a" numbers in Scott's and Gibbons). Including those varieties would add thousands more stamps to the count.
If the stamp has got a major number like 123 in Michel universe, it's a 1 in my counts.
If it's a color, watermark, type etc. variety with minor number such 123a or 123X or 123I, then it's a 0.
So when I speak/write 'different items', I mean items assigned with unique major catalog number in Michel universe.
That said, it does have shortcomings because of different editorial styles used over the decades. For example why are the Finnish watermark differences assigned a major number, whereas similar items from Romania are just minor number varieties? And then you've got differences between catalogs as well. It's like comparing apples to oranges... And I fear bit of the same applies when people say out loud (and compare) the size of
collections. Each collector uses different criterias. For example I and landoquakes say both of us are at approx. 91.5K different stamps. So basically our
collections should be of equal size. But likely they are not...
As for what constitutes a '
large collection'... I'd say that anyone having a collection stored in more than 50
large sized volumes is eligible to talk about about the true challenges of keeping everything up and running. The number of stamps in itself is somewhat non-essential. It's more about how to keep everything in order, how to find stuff quickly, how to find enough space to add new items and variations, how to control storage conditions, etc. And most importantly, how to scale up (because that's the only direction worldwide
collections will go).
Just my 5 cents worth,
-k-