In my experience, most Dutch bikes are more similar to the Brit "Roadster" models than they are to the Brit "Sports" models that a lot of Yanquis refer to as "British Racers." More like the Raleigh DL-1 than the Raleigh sports:
Roadster:
Sports:
Basically, the Roadsters have far slacker head- and seat-tube angles, and while the Brit roadsters tend to rock true 28"s instead of 26x1 3/8" wheels, you might find either size in the Dutch bikes. Rod brakes were common on the Nottingham roadsters and older Dutch models, but these days, most Dutchies have moved to drums... rod brakes live on with Indian and Chinese-built roadsters. Roadsters, like Dutch bikes, are also more likely to be full-dress commuter bikes, with full chaincases, generator lights, fancy sprung saddles, ring locks, and dropstands (sometimes), and maybe even a skirt/coatguard... whereas the Sports tended to have fenders, a hockey-stick guard, and maybe a kickstand.
For comparison, here is what I would consider to be a fairly "typical" Dutch bike:
(Azor Opafiets)
Dutch bikes might have 26x1 3/8"(590) tires; older ones are likely to have true 28"s (635), while newer models are just as likely to be wearing fat 700c (622) rubber.
Finding customized versions of these is hard, b/c while a lot of folks do mod their Dutch bikes, they're not usually candidates for RRB-style customization. However, RRB member
@CeeBee did build a fairly radical custom out of an Indian-built rod-brake Roadster that he chopped and grafted half of a Murray(?...might've been something esle, but i think it was a Murray) to the upper half of the frame.
The Rod (
Brake)
Rod
http://www.ratrodbikes.com/forum/index.php?threads/rod-brake-rod.87869/
HTH