There are I think 2 black ones on ebay.
This one has been on ebay for a long time and is the correct size, 16mm pins and flaring out to 24mm at the case.
But it is expensive (I would make an offer)
http://www.benl.ebay.be/itm/NOS-VINTAGE ... 1c24606790The code he gives in his description " THE WATCH BAND ENDS ARE STAMPED: B1661-L"
matches the code
http://www.digitalwatchlibrary.com/DWL/ ... wristtalk/Then there is I think this one
http://www.benl.ebay.be/itm/16mm-Seiko- ... 3a70d8343bNot specified but possibly the same (ask the seller) and the price is better.
(I paid about 19euro for mine)
Hope this helps
@ Cesar,
Thank you
It does look nice , I was in doubt of selling/trading it but I am not sure anymore...
And I have seen the original box on a secondhand site

But I should stop buying for a while or my wife will go crazy.