This one is my method for the big lots of a country.
I have a big magnifying glass with foot and a box of wood with 8 sections in two rows.
With the big and fixed magnifying glass I do not have to handle it to see the years of issue. I take a handful with the left hand and identify and place them in his stall rapidly with the right hand.
In the 1 º put the previous ones to 1959, 2 º 1960-9, 3 º 1970-9, etc.
Later I do the same thing with every decade, putting 0 and 5 on the table, in front of the box
Later I place them ordered in a small drawer and with a paper between every year.
I extend the stamps of every year on the table, grouped by series and already I pass to catalogue them
I write with pencil n º to the back and am placing them with the others.
In your card if I collect them, or in boxes of business cards if I do not collect them.
I go more than 40 years experimenting and this one is more rapid that I have found.