Summarize:
FACTORY CODES ON CARDBACKS:
1. Prior to 41 backs:
No Factory Codes present.
2. 41 - 48 backs:
Factory Codes present next to the pop:
K ("Kader" of Hong Kong)
U ("Unitoys" of Hong Kong)
S ("Smile")
3. 48 -79 backs:
Factory codes present on the bottom corner of the cardback:
TJ (Taiwan)
TW (Taiwan)
TC (Taiwan)
HN (Hong Kong)
HT (Hong Kong, Unitoys)
HG (Hong Kong, Kader.)
ME (Macau)
MC (Macau-->Mini Rigs)
So the first letter describes the location in the ROTJ area: T=Taiwan, M=Macau and H=Hong Kong, that is for sure.
The second is the factory code.
ASSUMED/KNOWN FACTORIES:
"Kader Industrial Co. Ltd." (known: "K"/"HG")
Established in Hong Kong in 1948, Kader celebrates 60 years as a leading plastics and toys manufacturer. Providing integrated manufacturing services and also specializing in fine scale model railroads, Kader's products continue to delight consumers of all ages around the world.
In the 70s and 80s, business from foreign clients continued to expand, leading the Company to produce such famous products as the original Star Wars figurines, Teddy Ruxpin and Cabbage Patch Kids. The Company also started its Mainland operations, opening its first factory in the border town of Shekou in 1983.
The move allowed Kader to overcome labour supply constraints in Hong Kong, making room for further growth. Led by sons Dr. Dennis Ting (currently the non-executive Chairman of Kader Holdings Company Limited) and Mr. Kenneth Ting, the Company was listed on the Hong Kong Stock Exchange in 1985.
"Uni Toys (H.K.) Limited " (known: "U"/"HT")
Uni Toys is a member of Uni-Fortune Toys Group which is a toy manufacturer as well as a Hong Kong based company. We own our factories in China and all the tooling, engineering and production are integrated at our China plant. In view of our high product quality and innovation concept of product design, we are granted to work with some renowned brands for years. Apart from our own products, our expertise on product development enables us to be competent to handle with OEM projects. Our manufacturing plant has been certified with ICTI and our products are complied with ASTM and EU toys product safety requirements.
"Smile Industries Ltd." (known: "S"/"??")
...still prodcues for "Lucas":
Smile Industries Ltd, Silver Manufactory Holdings Co Ltd Unit B 7 F Reliance Mfy Bldg 24 Wong Chuk Hang Rd Aberdeen HK | Lieferverzeichnis - [Panjiva]
no homepage...though?!?!?
"Jetta Company Ltd." (assumed)
Established in Hong Kong in 1977.
Focus on manufacturing of toys and gifts.
Started China factory from 1981.
Currently one of the largest OEM toy manufacturers:
5 major plants in China
Exceeding 40,000 employees.
sources:
Hong Kong Suppliers and Hong Kong Manufacturers | HKTDC
Hong Kong Toys Council
Kader Holdings Company Limited