I would agree on whitworth, the other imperial thread was British Standard Fine or BSF for short.
A further search as not brought anything definite regarding thread type, as most manufactures just them 1/4 or 3/8 inch camera threads.
I did find this, Quote. "But that is easier said than done: the Moskva-5 has a German screw tripod thread, but most modern tripods have English screw. There are adaptors and special plates available, but it's not ideal".
As the standard english threads are BSW & BSF it would seem that Whit is the answer.
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