The Big watch 42+mm is primarily a 1970s watch trend. Many folks thought these were the ugliest or most ungainly,
but they clearly drove the big watch craze of the last 5 yrs from Panerai to AP Offshore, to most sports watches today.

Also,I would argue the Manufacturers (Lemania / Valjoux) will play a big role in collectability.

I think a lot of guys "will buy it for the engine".

There are a lot of watch brands that are a bit obscure (Longines, Zodiac, Wittnauer, Tissot, Bucherer, Nivada, Tudor) but have excellent movements that are the same as higher end brands (Heuer, Bretling, Rolex).

These too will drive collectability as certain Omega (Plo Prof) and Heuer (Monaco) are beyond the rach of almost all collectors.

As a side note, Longines has timed almost all the Olympics; and did Fromula 1 for most of the 70s-80s.

Rolex still holds the crown in motorosports timing, and is the Prize given to Le Mans, ALMS, F1 drivers and Offical Timkeeper of the 24 H of LeMans

Rolex Daytona,
Tudor Monte Carlo,
Heuer Monaco,
Heuer Autavia 'Joe Siffert',
Heuer Daytona,
Heuer Carrera,
Heuer Jarama,
Heuer Jackie Icyk Easy Rider,
Heuer Monza,
Heuer Sliderule Bezel-Rally,
Heuer Camaro,
Heuer Cortina,
Heuer Sebring,
Heuer Pasadena,
Heuer Champion Plug,
Heuer Montreal,
Heuer Silverstone,
Heuer Gulf Logo,
Chopard Mille Miglia,
Girrard-Perregaurx Ferrari,
Seiko Speedtimer Chronograph,
Seiko Bull-Head (buttons on top, angled case),
Longines Km/H Tachymeter Chronograph,
Roamer Stingray,
Le Jour Rallye,
Tissot Chronograph PR156,
Eberhard & Co. 8 day timer,
Oris ChronOris Orange Racer,