I don't think there's any collector value, and - in Canada, at least - many shooting organizations now actually require that a holster cover the trigger. (Speaking for myself, I don't see myself buying a holster that does not cover the trigger.)
To maximize your profit potential, you should identify the specific fitment, including barrel length. Once you are confident of the specific fitment, a review of the (sold-for) prices on GunBroker will let you know what other customers' have paid; that'll give you an idea of approximate pricing. When you list the holster(s) for sale, I suggest that you include as much detail as possible, including details on the specific fitment(s), better photographs showing both sides of the holster(s), any known information about the holster manufacturer(s), any known information about the date (range) of manufacture, and your shipping policy.
I think that you'll find that the shipping cost will be a big factor in whether or not these sell via CGN. If you don't manage to sell them via CGN, you can take them to a (post-lockdown) gun show, rent a table, and sell them there.
