This is London Stereoscopic Company’s card, unnumbered as far as we can see.  Not postally used, but with a long message from 1913 completely covering the message and address areas.  We like the message, which would not likely be written in contemporary times:  “…don’t come to London, the smooth and easy road to Hades doesn’t begin to be lined with the temptations that the shops of London hold out …”  (There’s much more.)  Grade (only because of the writing): 4