I don't really understand the "sanctity" of a breech loading double with two cylinder bore 29 5/8" barrels, even if Holland did make the gun like that originally. Who would be beating your door down to buy it? If the man wants choke he should have choke. What would you do if it were yours (not addressed to any one poster in particular) and you find out that it was all original ........ try to convince yourself you really didn't need any choke in the first place, or try to find a buyer that wanted a 29 5/8" barreled double with no chokes?
SRH