Thank you for posting!
CapO website:
www.capo.at
Can we get a drive side photo? Simplex derailleurs and hubs? Details of dropouts?
The 6-digit serial number suggests late 1960s production, which we may be able to verify from any date codes you can find on the components, assuming they are original. Does yours have any frame tubing pedigree markings, such as Reynolds 531? What is your seat post diameter (bigger is generally better in vintage steel frames)? Yours might be a Flitzer or a Zehn Gang / Ten Gear (Speed) model.
Yours is a European model that never made it across the Atlantic -- Capo (founded in 1930 by Otto Cap in Vienna, and operated today by his son, Harald) or Cap:O, per Harald's latest logo, exported only about 400 bikes to the US, all circa 1960. I have attached photos of my two Capos, with the obvious resemblance between yours and my Modell Campagnolo.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069