From: James Redin
The Hanimex 807 is listed in the "Collector's Guide to Pocket Calculators" (Guy Ball and Bruce Flamm) as made in Hong Kong in 1975. Hanimex was a British company. I also have a Hanimex in my collection (Model VP8M). They are very interesting because of the way the memory is handled (single key).
The Toshiba BC-603L is also listed on the book, however the Royal SR900 is not (which makes it more rare if it was made during the 70's.)
In any case the book shows no pictures of them. If you have pictures, please send me a copy and I will post them at my Web site, or send a copy to Guy Ball for him to include it in his addendum to the book.
The X-Number World of Calculators