Perhaps there are metal drawer-slides or other hardware that may have manufacturers' name , or other clues stamped on them .
Sorta reminds me of an american (or other) interpretation of 'funiture-o'-the-future' during the 50's-60's .
The wheeled tripod legs , if original , had the design for a specific purpose , in my opinion (semi-portable) .
Can't say anything about the maker , as I've not seen a secretary/receptionist desk exactly like yours ...
maybe it was custom-made ?
Do you think it is the original finish ?