Tommy,  Generally speaking you are correct in assuming that the lower
model numbers Wurlitzer assigned to its organs were for simpler models
and the higher numbers (up to 180) were for its more elaborate organs.

Complicating the picture is the fact that some models were the earlier
brass-trumpet organs with simpler natural oak facades while other
models having similar numbers were the later all-wood-pipe organs with
painted ornamental facades.  This change in organ character reflects
the change in the band organ market when skating rinks ceased to be a
major purchaser of organs and carousels and dance halls became their
prime purchasers.

When Ron Bopp's soon-to-be published history of the North Tonawanda
band organ industry appears, I think you will find that book packed not
only with the kind of information you are seeking but also with lots
of pictures of rarely-seen Artizan, North Tonawanda, DeKleist, and
Wurlitzer organs.

You should drop Ron an email (bopp@server.greencis.net) if you want to
be notified about this great band organ book's appearance.

Matthew Caulfield