In my opinion, the only Compax that left the factory with a pulsations bezel is the reference 885105/02. Anything else was amended at a later date, whether that was at point of sale in 1973 or years later we'll never know.
The 885103/01 and /02 are in the 1969 catalogue but not the 885105/02, suggesting that the pulsations bezel variations came later, which seems consistent with the reference number being slightly higher (generally true but not always).
All three of the above references remained in the catalogues right up to and including 1976-1977. Whether these were still being produced or were old stock seems irrelevant, they were for sale.
The 885108 referred to in the chain above is a completely different watch and did not have a pulsations bezel.
I think this all seems fairly clear. Happy to consider further if you disagree.
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