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I guess as the mechanical slot era ended in the USA the lines were becoming blurred as companies went out of business and others bought up their tooling and spares.
I just came across this four reel Mills Primadonna from 1964, just about the last Mills model, and clearly made for US bases in the Far East. The design is plain but the artwork makes it rather desirable. The point is, at the same time (1964) the very last Pace looking machine came out also called Primadonna looking very much like the Mills but only three reels and accommodating the Pace round escalator. No wonder we have trouble identifying machines form time to time.

Primadonna was/is a Casino in Reno and the script matches theirs in these machines.

The Mills Open Front started with a proper escalator left hand entry rather than the less appealing S10 on these machines. Suspect Paul this is a style thing, most manufacturers were similar with big colourful belly glasses, square steel boxes and a bit of chrome, eg Aristocrat Nevada, Jubilee Riviera and even Bally’s.......

I bought an open front from this site many years ago owned by JC on a console table, still have it somewhere