Great Britain 1883 Switzerland Postage Due Forwarded Agent Stationery Card Geneva

1/2d postal stationery card, postmarked London (31 Aug), address crossed-out and redirected to Geneva (Hotel National), with c.d.s. receiver (2 Sep), affixed with 5c Swiss postage due, futher tied by Geneva c.d.s., reverse with oval "Forwarded by / Mr. Burr / London" travel agency cachet, though appearance of a forwarding agent cachet, a striking and attractive card, and late use of a forwarding agent.