The provided URLs do not offer specific information about a company named "Seis" at http://www.seis.com or http://www.linkedin.com/company/seis-card. However, based on general knowledge, "SEIS" could refer to the Seed Enterprise Investment Scheme, a UK government initiative to support startups by offering tax incentives for investors[3][5]. If "Seis" is a company, it might be involved in financial services or technology, but without specific details, this cannot be confirmed. Unique selling propositions would depend on the company's actual services and mission.