This sculpt was a 1987 sculpt (as per here) which was never released during the Rogue Trader era; it was much later discovered as part of his collection and released in 2015 by Wargames Foundry, and is available as part of the Empirical Absolution and Liquidation Squad shown here.
The original GW unreleased minis had a slotta base, the 2015-onward Wargames Foundry copies have a sculpted base as shown here.
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