Here in Italy we have not many Underwood 'Olivettis' , understandably. There are probably more model 5 still lugging around than model 450 (my '5' is a 1913 model, 111 years old and God knows how many revamps, and still working fine). So .. I think I never saw a 450 in the flesh. But honestly,  this time the plain, unassuming  Underwood is nicer-looking than the fashionable Sottsass/Von Klier 'Studio' sister. Never liked that much the Valentine and the Studio 45, despite the cult status of the former. But I find their computers and calculators and standards terrific!  Olivetti Logos desktop calculators in particular are piece of art  imho.  The  450 looks every bit as sharp.
I think the cinematic of the 45/450 is close to that of the Lettera 35, thus still  the  older Lettera 32 ultra-portable made bulkier,  and some plastic part  starting to appear, like carriage knobs,  lever tops and margin tags. Still great user machines: my father used his 35 for decades and I still have and use it.

Hi Duna,

Will do when I have the machine home and serviced.

Speaking of Olivetti adding machines.  This one I kept for my collection :
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You will probably hate this, but I have broken two (totally unrepairable and rusty) Olivetti Summa Primas for parts in the last five years.  They are an excellent source of springs, screws, nuts, knobs and feet for repairing typewriters - particularly Olivetti typewriters.

I like the black and white colour scheme of the 450.  I'll be interested to see whether it is a true 10cpi or not as well. 

Nice adding machines too!

My goodness me.  That picture of the Facit adding machine brings back memories.  They were also sometimes sold in the UK as ADDO, but with a deep yellow outer casing.