Have not found much , save for an inquiry in July 2007 by a poster named 'Ed' & a newer inquiry from Feb. 2010 , at the website "drtoy.com" .
!00% with dontbe on the collectable aspect of vintage & antique toys !!!
A point of fact , concerning Chinese-manufactured toys , is that it's very frequent that these companies will often produce a small 'line' of toys ... if they don't sell well (& sometimes if they do) the company will close it's doors & move on to the next thing , esp with the smaller firms .
Locating resources about/from such companies often gets relegated to the dumpster (even if they sold on-line) & then it's rather up to collectors of such to document/record info about these companies & their products .