Most of the time, i just telnet/ssh from the PC running Windows NT, using a generic cheap PC keyboard. This Ultra5 is used as a server, it is one of the test bed for releasing our ecommerce software. Sun Microsystems Type 6 Keyboard.

From a layout perspective, they are exactly the same. (I have both a Type 6 US layout, and a Type 7 US layout, I put them side by side to compose this reply and not make any mistakes). From a design/construction, there are subtle differences, first of all the Sun Type 6 is GREY, the type 7 is all WHITE. Second the Type 6 lower side (near your hands) ends with a curve. The Type 7 ends abruptly (more square, if you prefer). And perhaps the most noticeable of all, the Type 7 sports a 'Sun-Oracle' logo exactly in the middle (above F8) while the Type 6 had the traditional Sun Microsystems logo at the top-right corner.

The icing on the cake for the Type 7 is its internal USB hub, with two USB female ports at the top, which the Type 6 lacked. The Sun keyboards are available in two basic layouts for a particular language, the UNIX layout and the PC Layout. In bahamat's photos below, the top photo of the Sun Type 6 has the PC layout and, below, the Sun Type 7 has the UNIX layout.

@aissacf is correct; the Type 6 and 7 keyboards with the UNIX layout are exactly the same and the Type 6 and 7 keyboards with the PC layout are also exactly the same. If requested, I can take photos of the keyboard I'm using at this very moment, a Sun Type 7 PC layout. – Jan 5 '16 at 12:18.