Site: Legacy Verified
URL: https://legacyverified.tw
Description: A site to determine if a twitter username was verified by twitter prior to private purchase in October, 2022.
Site created by Andrew Baron

Method:
Dataset compiled by Travis Brown.
A. This dataset accounts for information obtained up until April 5, 2023.
B. According to Brown, there are approximately 407,520 legacy verified accounts, compiled from the 419,119 accounts that were followed by the twitter @verified account, and 406,915 accounts marked by the twitter API as having legacy verification. Reference
C. Though the dataset may exclude some number of legacy verified accounts in the hundreds or low thousands, it appears to be essentially complete.
D. Chrome extension for displaying a legacy-check when viewing twiter.com [check back later today or tomorrow].
E. If you think this was awesome, be sure and check out one of my other tools, ismycomputeron.com