Crown Lynn Swan numbers ...

As a reference, these are the numbers on the bases of Crown Lynn Swans:

154   - the baby swan.

2065 - the later four digit number for the 154 baby swan made after 1964.  
[Made at Titian Potteries when it was owned by Crown Lynn]

2066 - the later four digit number for the 170 large swan made after 1964.  
[Made at Titian Potteries when it was owned by Crown Lynn]

2147 - the middle sized swan.  These were not made for very long, around a year I believe in 1981. (Made at the Titian factory when it was owned by Crown Lynn)

170   - the large female swan and this number was also used for the 'male' swan as well.

Bumping this post back up to the top, as there is a lot of interest in these swan numbers.
I have edited the post a little for clarification.

Large white swan as per photos. belonged to my mum so has to be 40 or 50 years old. Perfect condition nd has numbers on base which I think are 2066

The 2066 swan was first made from 1971.
It will be worth from between $150 to $300 on Trade Me.

I really puzzles me that the shape number 170 was used for both 'male' and 'female' swans when they are completely different.
One of life's little mysteries....