The serial number of 50 sen bird definitive has moved up to 2007/7. So, seven batches of printing for the 50 sen bird definitive in year 2007 have been recorded. I'm not sure how many more batches of printing for the 50 sen bird definitive in 2007...... we just have to wait until the appearance of series number 2008 to make a conclusion for year 2007. On the other hand, the 30 sen bird definitive has reached series number 2008/2 (http://kajang-stamps.blogspot.com/2008/07/2005-bird-definitives-30sen-20082.html).