Same as 310 but with base instead of bellset. Very rare in red-brown colour – think the 310s on open bellsets only came in the regular Siemens mottled brown colour.
I found it difficult to photograph this phone. The photographof the base shows the red-brown colour more clearly.
Interested to know more about this phone and the Siemens colour variants so please drop me an email if you have seen one before.