hardware type of a sun

hardware type of a sun can be determined on-line using the following command

sunOS

% dmesg | grep cpu
cpu = SUNW,SPARCstation-5

Solaris

% dmesg | grep nexus
cpu = SUNW,SPARCstation-5

The result is obvious for SPARCstation-5 but other answers need interpretation:

response	SPARC
SUNW, Sun 4/50	Sparc IPX
SUNW, Sun 4/75	Sparc 2