Sielwall-Reederei Rolf Faulbaum K.G. had a different Bremen address but likewise used ship names ending in wall and was also operated by Gottfried Steinmeyer. Its last ship, Burgwall, passed without renaming to Sielwall-Reederei H. Renzell in 1969. Mitchell also associates Faulbaum with S. Stein, without further detail.
Keep the explicit scope label independent; no alias or company identity is inferred.