Rare doesn’t always mean valuable. Many of the 70’s service dials are quite rare. It’s speculated they were made in small number batches so new variations are still being found. Long indices/short indices, pro/no pro, wide t/narrow t etc. It doesn’t make them valuable as ultimately they’re not original.
It certainly doesn’t back up any theory that twisted lug cased Speedmasters ever came with pre pro dials. The only ‘evidence’ I’ve ever seen to back this theory up is an advertisement showing such a configuration, but this is an artists rendering, not an actual watch. Conversely, there are little/no examples of original looking watches being seen with twisted lugs and pre pro dials in standard configuration. Moonwatch only also says all twisted lug cased standard dial speedmasters came with pro dials.